Question 1: What does the UF goal represent and how is it determined for each treatment?

• The maximum blood flow rate achievable during treatment
• The total volume of fluid to be removed, calculated from weight gain since last treatment (Correct answer)
• The dialyzer clearance capacity for urea
• The volume of saline to be administered during treatment

Correct answer: The total volume of fluid to be removed, calculated from weight gain since last treatment

The UF goal is the total fluid volume to be removed, determined by subtracting the patient's dry weight from their current pre-dialysis weight.

Question 2: The first step in treating malnutrition in a dialysis patient is usually to ____________.

• encourage the patient to eat more (Correct answer)
• provide various dietary supplements
• provide intradialytic parenteral nutrition
• provide total parenteral nutrition

Correct answer: encourage the patient to eat more

Malnutrition is common in dialysis patients due to dietary restrictions, loss of appetite, and catabolism. The initial and most fundamental step in addressing malnutrition is to encourage and educate the patient on increasing their oral intake of appropriate foods. This approach is less invasive and often more sustainable than supplements or parenteral nutrition, which are typically considered if dietary modifications are insufficient.

Question 3: What is the role of the ultrafiltration pump in dialysis?

• To remove excess fluid from blood (Correct answer)
• To monitor the patient's blood pressure
• To increase blood flow
• To prevent blood clots

Correct answer: To remove excess fluid from blood

The ultrafiltration pump plays a specific role in dialysis by precisely controlling the rate at which excess fluid is removed from the patient's blood. By creating a pressure gradient across the dialyzer membrane, it ensures that the correct amount of water is extracted, preventing fluid overload and its associated complications like hypertension and pulmonary edema.

Question 4: According to the 'Rule of 6s,' which set of criteria indicates that an AV fistula is mature and ready for cannulation?

• Flow >600 mL/min, diameter ≥6 mm, depth ≤6 mm, maturation ≥6 weeks (Correct answer)
• Flow >500 mL/min, diameter ≥5 mm, depth ≤5 mm, maturation ≥5 weeks
• Flow >400 mL/min, diameter ≥4 mm, depth ≤8 mm, maturation ≥4 weeks
• Flow >800 mL/min, diameter ≥8 mm, depth ≤4 mm, maturation ≥8 weeks

Correct answer: Flow >600 mL/min, diameter ≥6 mm, depth ≤6 mm, maturation ≥6 weeks

The Rule of 6s states a fistula is mature when it has blood flow exceeding 600 mL/min, a vessel diameter of at least 6 mm, is no more than 6 mm below the skin surface, and has had at least 6 weeks to mature. These thresholds help ensure reliable cannulation and adequate dialysis delivery.

Question 5: What should you do if there is a blood leak detected during dialysis?

• Continue dialysis and monitor the patient
• Stop dialysis and check for leaks (Correct answer)
• Switch to a new dialyzer
• Increase blood flow

Correct answer: Stop dialysis and check for leaks

If a blood leak is detected during dialysis, it indicates a breach in the integrity of the extracorporeal circuit, which can lead to blood loss, contamination, or exposure to dialysate. The immediate and correct action is to stop dialysis to prevent further complications and thoroughly investigate the source of the leak. Continuing treatment or increasing blood flow would be dangerous and could exacerbate the problem.

Question 6: Which of the following is a function of the End-Stage Renal Disease Networks?

• Pay for patient services.
• Set Centers for Medicare & Medicaid Services standards of care.
• Provide the pay-for-performance program.
• Help resolve patient-staff conflicts. (Correct answer)

Correct answer: Help resolve patient-staff conflicts.

End-Stage Renal Disease (ESRD) Networks are federally mandated organizations that oversee the quality of care for dialysis patients within specific geographic regions. One of their key functions is to provide a mechanism for resolving patient grievances and conflicts, including those between patients and staff. They act as an impartial third party to ensure patient rights are upheld and concerns are addressed appropriately.

Question 7: During a water quality check, the RO product water conductivity reading is 45 μS/cm, significantly higher than the baseline of 8 μS/cm. What does this most likely indicate?

• The RO membrane is failing or bypassed, allowing solutes to pass through into the product water (Correct answer)
• Normal seasonal variation in source water mineral content
• The softener has been regenerated and is releasing excess sodium temporarily
• The carbon tank is exhausted and releasing chloramine into the RO feed

Correct answer: The RO membrane is failing or bypassed, allowing solutes to pass through into the product water

A sudden increase in RO product water conductivity from 8 to 45 μS/cm (nearly 6-fold increase) indicates that the RO membrane is no longer effectively rejecting dissolved solutes. This is a significant quality failure requiring immediate investigation and potentially halting patient treatments until resolved.

Question 8: A patient arrives for hemodialysis and their pre-treatment weight is 4.2 kg above their established dry weight. What should the technician do FIRST?

• Verify the weight on a calibrated scale and document the finding before notifying the nurse (Correct answer)
• Begin treatment immediately at the maximum ultrafiltration rate
• Independently lower the patient's recorded dry weight in the system
• Shorten the treatment session to limit total fluid removal

Correct answer: Verify the weight on a calibrated scale and document the finding before notifying the nurse

Before acting on a significantly elevated fluid gain, the technician must confirm the measurement is accurate using a calibrated scale, then document and report it to the nurse so an appropriate ultrafiltration goal can be safely ordered.

Question 9: The technician finds that the total chlorine level in the water is 1.1 parts per million (ppm) and the free chlorine level is 0.9 ppm while testing for the presence of chloramine. As a result, the amount of chloramine is ____________.

• 2.0 ppm.
• 4.0 ppm.
• 0.4 ppm.
• 0.2 ppm. (Correct answer)

Correct answer: 0.2 ppm.

Chloramine can be combined with ammonia to create a long-acting form of chlorine; it cannot be measured directly, but the chloramine level can be calculated by deducting the free chlorine from the total chlorine: If, when testing water for the level of chloramine, the technician finds that the total chlorine level is 1.1 parts per million (ppm) and the free chlorine level is 0.9 ppm, the chloramine level is 0.2 ppm. 1.1 - 0.9 is equal to 0.2 ppm, or 0.2 mg/L. The dialysis chloramine limit is 0.1 mg/L.

Question 10: How frequently must dialysis water bacteria and endotoxin testing be performed according to AAMI standards?

• Monthly at minimum; more frequently for high-risk or after system changes (Correct answer)
• Only when a waterborne infection outbreak is suspected
• Once per year is sufficient for stable systems
• Every 6 months for established facilities

Correct answer: Monthly at minimum; more frequently for high-risk or after system changes

AAMI RD52 requires monthly microbiological testing of dialysis water and dialysate, with more frequent testing after system maintenance or when results approach action limits.

Question 11: What type of water quality testing documents are required to be maintained in the dialysis facility?

• Water test results are maintained only by the water treatment vendor and not required on-site
• Daily chlorine/chloramine logs, monthly bacteriology and endotoxin results, and annual chemical analysis, retained for at least 2 years (Correct answer)
• Only monthly bacteriology reports are required by CMS
• Only the annual state inspection water quality report is required

Correct answer: Daily chlorine/chloramine logs, monthly bacteriology and endotoxin results, and annual chemical analysis, retained for at least 2 years

Facilities must maintain comprehensive water quality records including daily chlorine/chloramine logs, monthly microbiological results (bacteria and endotoxins), and annual chemical analysis for all AAMI-required contaminants. CMS Conditions for Coverage require these records to be retained and available for surveyor review.

Question 12: What is the primary reason dialyzer reuse programs require each patient to have their own dedicated dialyzer?

• To comply with insurance billing requirements
• To reduce the cost of dialyzer replacement
• To allow more accurate TCV measurements
• To prevent cross-contamination and bloodborne pathogen transmission between patients (Correct answer)

Correct answer: To prevent cross-contamination and bloodborne pathogen transmission between patients

Each patient must have their own dedicated dialyzer to prevent cross-contamination with bloodborne pathogens such as HIV, hepatitis B, and hepatitis C. Sharing dialyzers between patients is strictly prohibited regardless of reprocessing.

Question 13: A technician notices the reuse count on a dialyzer has reached the facility's maximum allowed reuses. What is the correct action?

• Reprocess the dialyzer one additional time with double germicide concentration
• Report to the nephrologist before discarding
• Continue using the dialyzer if TCV is still within acceptable limits
• Discard the dialyzer and document the disposal (Correct answer)

Correct answer: Discard the dialyzer and document the disposal

When a dialyzer reaches the facility's maximum reuse count, it must be discarded regardless of TCV or visual appearance. The reuse limit is a safety boundary set by the facility based on manufacturer data, regulatory standards, and clinical policy.

Question 14: If a patient is concerned about loss of income because of the need for hemodialysis, the best person to speak to the patient about this concern is the ___________.

• occupational therapist
• social worker (Correct answer)
• nephrologist
• nurse

Correct answer: social worker

Social workers in a dialysis center are specifically trained and equipped to address the psychosocial and financial challenges faced by patients with end-stage renal disease. They can provide resources, guidance, and support regarding income loss, insurance, disability benefits, and other financial concerns. Their role is crucial in helping patients navigate the broader impact of their illness.

Question 15: Which chemical is most commonly used as a germicide during manual dialyzer reprocessing?

• Formaldehyde
• Peracetic acid (Correct answer)
• Glutaraldehyde
• Bleach (sodium hypochlorite)

Correct answer: Peracetic acid

Peracetic acid (PAA) is the most commonly used germicide for dialyzer reprocessing because it is effective, relatively safe, and dissipates rapidly. Formaldehyde was historically used but has largely been replaced due to health hazards.

Question 16: A patient requests that a family member be present during dialysis treatment. What is the appropriate response?

• Deny the request as visitors disrupt treatment
• Facilitate the request in accordance with facility policy; patient rights support having support persons present (Correct answer)
• Require the physician to authorize visitor presence
• Allow visitors only during the last hour of treatment

Correct answer: Facilitate the request in accordance with facility policy; patient rights support having support persons present

CMS ESRD patient rights include the right to have visitors present during treatment within reasonable facility guidelines, and this request should be honored.

Question 17: Which AAMI standard specifically governs dialyzer reprocessing for hemodialysis?

• AAMI TIR34
• AAMI RD5
• AAMI RD47
• AAMI RD52 (Correct answer)

Correct answer: AAMI RD52

ANSI/AAMI RD52 is the standard that specifically addresses the reuse of hemodialyzers, outlining requirements for cleaning, testing, germicide use, documentation, and quality assurance in dialyzer reprocessing programs.

Question 18: The technician's role in patient teaching should be to:

• assess the patient’s barriers to learning
• reinforce teaching that the patient has received from other team members
• determine the patient's learning needs (Correct answer)
• check the patient's readiness to learn new information

Correct answer: determine the patient's learning needs

While technicians reinforce teaching, their primary role in patient education is to assess and determine what specific information the patient needs to learn or understand regarding their treatment and self-care. This involves identifying gaps in knowledge, addressing concerns, and tailoring information to the patient's individual comprehension level. This foundational step ensures that teaching efforts are relevant and effective.

Question 19: Which of the following non-prescription remedies might help treat symptoms if a patient complains of chronic itching?

• Avoid bathing.
• Take oatmeal baths. (Correct answer)
• Take cold showers.
• Apply rubbing alcohol.

Correct answer: Take oatmeal baths.

Taking oatmeal baths can help to calm the skin and alleviate itching if a patient complains of recurrent itching. Maintaining healthy skin moisture (with products like Aveeno® or Cetaphil®) may also be beneficial. For the majority of kidney dialysis users, itching is a concern. Patients who are itching should always be evaluated by the nurse. Hyperparathyroidism may cause itching, thus treating it may assist with symptoms. Phosphate binders could be helpful if the patient has too much phosphorus in their system.

Question 20: Which iron preparation is commonly administered intravenously during hemodialysis sessions to treat iron deficiency anemia?

• Vitamin B12 injection
• Ferric citrate oral tablet
• Iron sucrose (Correct answer)
• Oral ferrous sulfate

Correct answer: Iron sucrose

Iron sucrose is a commonly used IV iron formulation that can be administered during hemodialysis to replenish iron stores.

Question 21: What is the appropriate gauge needle to use for hemodialysis cannulation in standard adult patients?

• Gauge does not matter as long as blood flow is adequate
• 18-gauge (largest diameter)
• 15 to 17 gauge needles are standard for most adult hemodialysis patients (Correct answer)
• 20 to 22 gauge needles to minimize vessel trauma

Correct answer: 15 to 17 gauge needles are standard for most adult hemodialysis patients

15 to 17 gauge needles are the standard size for hemodialysis, large enough to achieve prescribed blood flow rates (300 to 500 mL/min) without excessive negative pressure.

Question 22: How often should activated carbon filters in the dialysis water treatment system be tested for chlorine/chloramine removal efficacy?

• Before the first patient treatment of each day and after each shift (Correct answer)
• Only when the reverse osmosis membrane is being serviced
• Weekly, or after any water utility maintenance in the area
• Monthly, with daily visual inspection of filter condition

Correct answer: Before the first patient treatment of each day and after each shift

AAMI standards require testing the effluent of the activated carbon filters for total chlorine and chloramines before the first patient treatment of the day and after each shift change, because carbon capacity can be exhausted at any time, and breakthrough is not visually detectable.

Question 23: In a non-urgent clinical situation, how long should a technician typically wait before cannulating a newly placed synthetic AV graft?

• 24–48 hours
• 3–6 months
• 3–5 days
• 2–4 weeks (Correct answer)

Correct answer: 2–4 weeks

Standard synthetic AV grafts require approximately 2–4 weeks of healing time to allow the graft material to incorporate into surrounding tissue and edema to resolve, reducing the risk of infiltration and hematoma on first cannulation. Early cannulation grafts are a separate product designed for use within 24–72 hours.

Question 24: Which electrolyte imbalance most commonly requires emergent treatment during hemodialysis, and what medication may be given IV?

• Hypocalcemia treated with magnesium sulfate
• Hyperkalemia treated with calcium gluconate or dextrose/insulin (Correct answer)
• Hyperphosphatemia treated with sodium bicarbonate
• Hyponatremia treated with furosemide

Correct answer: Hyperkalemia treated with calcium gluconate or dextrose/insulin

Hyperkalemia is life-threatening in dialysis patients; IV calcium gluconate stabilizes the cardiac membrane, and dextrose/insulin shift potassium intracellularly as temporizing measures.

Question 25: What is the target daily caloric intake recommendation for a hemodialysis patient to maintain weight and prevent catabolism?

• 30–35 kcal/kg/day (Correct answer)
• 40–45 kcal/kg/day
• 50 kcal/kg/day
• 20 kcal/kg/day

Correct answer: 30–35 kcal/kg/day

KDOQI and most nephrology nutrition guidelines recommend 30–35 kcal/kg of body weight per day for hemodialysis patients to meet energy needs, maintain nitrogen balance, and prevent protein catabolism. Patients under 60 years and those with higher activity levels typically need the higher end of this range.

Question 26: Which of the following is the earliest and most reliable sign of needle infiltration during a hemodialysis treatment?

• Localized swelling and pain at the needle insertion site (Correct answer)
• An increase in the arterial pressure alarm above baseline
• A sudden drop in the venous pressure alarm
• Blood appearing in the arterial drip chamber

Correct answer: Localized swelling and pain at the needle insertion site

Infiltration occurs when the needle tip exits the vessel lumen into surrounding tissue. The immediate result is extravasation of blood or dialysate, causing localized swelling, firmness, and pain at the site. Pressure alarms may change secondarily but are not as specific or early an indicator.

Question 27: How do you assess the adequacy of dialysis?

• Through clinical measures and lab tests (Correct answer)
• By checking the dialysis machine settings
• By monitoring blood pressure changes
• By patient feedback on comfort

Correct answer: Through clinical measures and lab tests

The adequacy of dialysis is primarily assessed through objective clinical measures and laboratory tests. Clinical assessments include evaluating the patient's fluid status, blood pressure, and overall well-being, while lab tests such as the Urea Reduction Ratio (URR) and Kt/V provide quantitative data on how effectively waste products like urea are being removed from the blood. Patient feedback, while important for comfort, is subjective and not the main indicator of treatment efficacy.

Question 28: Substances that form ions (charged particles) are __________.

• electrolytes (Correct answer)
• amino acids
• enzymes
• hormones

Correct answer: electrolytes

Electrolytes are substances that, when dissolved in water, dissociate into ions (electrically charged particles). These ions are crucial for various bodily functions, including nerve impulses, muscle contractions, and maintaining fluid balance. They play a vital role in cellular processes and overall physiological stability.

Question 29: A patient on dialysis is prescribed a phosphate binder. When should the patient take this medication to achieve maximum effectiveness?

• First thing in the morning on an empty stomach
• With or immediately before each meal and snack (Correct answer)
• At bedtime to allow overnight absorption
• Immediately after dialysis to replace dialysis losses

Correct answer: With or immediately before each meal and snack

Phosphate binders work by binding dietary phosphorus in the gastrointestinal tract and preventing its absorption. They must be taken with or immediately before meals and snacks to be in the gut at the same time as the ingested phosphorus.

Question 30: A dialysis facility receives an unannounced survey visit from a CMS state survey agency. What is the correct response of the facility and staff?

• Request to reschedule the survey for a more convenient time and notify facility corporate management first
• Cooperate fully with surveyors, provide requested records and access, and answer questions honestly (Correct answer)
• Immediately call the facility's legal counsel before allowing surveyors access to patient records
• Instruct staff to only discuss positive outcomes and refer all clinical questions to the administrator

Correct answer: Cooperate fully with surveyors, provide requested records and access, and answer questions honestly

CMS surveys are typically unannounced. Facilities are required to cooperate fully with surveyors—providing access to all areas, records, and staff as requested. Interfering with a survey, coaching staff to give misleading information, or withholding records is a serious CfC violation.

Question 31: Patients with uremia develop foamy or bubbly urine because _________.

• the kidneys remove less water
• wastes combine to create a chemical reaction
• urination is less frequent
• protein leaks into the urine (Correct answer)

Correct answer: protein leaks into the urine

Foamy or bubbly urine in patients with uremia is often a sign of proteinuria, meaning protein is leaking into the urine. Damaged kidneys, unable to filter properly, allow larger protein molecules to pass through into the urine. When these proteins are present, they can create foam when the urine is agitated, indicating impaired kidney filtration.

Question 32: If a dialysis center uses electronic charting, the technician may share his/her password with ________.

• no one (Correct answer)
• nephrologist
• nurse
• supervisor

Correct answer: no one

Sharing passwords for electronic charting systems is a serious breach of patient privacy and data security, violating HIPAA regulations. Each healthcare professional is assigned a unique password to ensure accountability for their actions within the system. Maintaining individual password confidentiality is essential to protect sensitive patient information from unauthorized access and maintain the integrity of medical records.

Question 33: What is a key consideration when positioning a dialysis patient?

• Make sure patient is seated upright with access visible (Correct answer)
• Elevate legs above heart at all times
• Recline fully during the first hour
• Position patient away from the machine

Correct answer: Make sure patient is seated upright with access visible

When positioning a dialysis patient, it is essential to ensure they are seated upright with their access visible for several reasons. This position promotes comfort, allows for easy monitoring of the access site for complications like bleeding or infiltration, and facilitates efficient treatment delivery. Proper positioning also helps prevent discomfort and potential injury during the long treatment session.

Question 34: What is the typical duration of a hemodialysis treatment?

• 1 to 2 hours
• 2 to 3 hours
• 6 to 8 hours
• 3 to 5 hours (Correct answer)

Correct answer: 3 to 5 hours

Hemodialysis treatments typically last 3 to 5 hours, performed three times a week. This duration is necessary to allow sufficient time for the dialyzer to effectively remove accumulated waste products, toxins, and excess fluid from the patient's blood. The specific duration is tailored to the individual patient's needs, kidney function, and fluid status to achieve optimal clearance.

Question 35: How long can a reprocessed dialyzer typically be stored before it must be used or discarded?

• 3 days
• 24 hours
• 7 days (Correct answer)
• 14 days

Correct answer: 7 days

Most reprocessed dialyzers filled with germicide have a storage life of 7 days. After this period, the germicide may have degraded below effective concentrations, potentially allowing microbial growth inside the dialyzer.

Question 36: During needle removal at the end of hemodialysis, a patient's AV fistula site bleeds continuously for 20 minutes despite applying pressure. What should the technician do?

• Notify the nurse immediately while maintaining firm, focused pressure on the needle sites without completely occluding flow (Correct answer)
• Apply more pressure and wait an additional 20 minutes before seeking help
• Apply a hemostat (clamp) to the skin over the bleeding site
• Apply a tourniquet above the elbow to stop all flow through the fistula

Correct answer: Notify the nurse immediately while maintaining firm, focused pressure on the needle sites without completely occluding flow

Prolonged bleeding after needle removal requires immediate notification of the nurse while maintaining appropriate pressure. The key is to apply firm pressure to the needle sites specifically without completely occluding the fistula (which can cause thrombosis). A tourniquet would risk fistula thrombosis.

Question 37: What should you do if the dialysis machine alarms due to a low blood flow?

• Continue dialysis
• Check for clots or kinks (Correct answer)
• Increase the blood flow rate
• Stop dialysis immediately

Correct answer: Check for clots or kinks

A low blood flow alarm during dialysis typically indicates an obstruction or issue within the extracorporeal circuit or the patient's vascular access. Common causes include kinks in the bloodlines, clotted access, or vasospasm. The appropriate response is to investigate and resolve these mechanical issues to restore proper blood flow and ensure effective dialysis treatment.

Question 38: What is the primary role of carbon tanks in the dialysis water treatment system?

• Eliminate bacteria and endotoxins through UV irradiation
• Filter out particulate matter larger than 5 microns
• Remove calcium and magnesium ions through ion exchange
• Adsorb chlorine and chloramines before water reaches the RO membrane (Correct answer)

Correct answer: Adsorb chlorine and chloramines before water reaches the RO membrane

Carbon tanks use activated carbon to adsorb chlorine and chloramines from the feed water. These chemicals must be removed before the water contacts the reverse osmosis membrane, as they can degrade the membrane and, if they reach the patient, cause hemolytic anemia.

Question 39: When should healthcare workers wear masks in dialysis?

• When there is a risk of exposure to respiratory droplets or bloodborne pathogens (Correct answer)
• Only when treating infected patients
• Whenever a patient is in the dialysis unit
• Only when patients request it

Correct answer: When there is a risk of exposure to respiratory droplets or bloodborne pathogens

Healthcare workers should wear masks in dialysis when there is a risk of exposure to respiratory droplets (e.g., during coughing or sneezing) or when performing procedures that may generate splashes or sprays of blood or body fluids. This practice, part of standard precautions, protects both the worker and the patient from airborne or droplet-transmitted infections.

Question 40: Why must hemodialysis machines undergo disinfection between patient treatments?

• To remove mineral deposits that reduce machine efficiency
• To recalibrate the pressure sensors for accuracy
• To eliminate biofilm and pathogens that could contaminate future patients' blood circuits (Correct answer)
• To remove residual dialysate that would alter the next patient's treatment

Correct answer: To eliminate biofilm and pathogens that could contaminate future patients' blood circuits

Machine disinfection destroys biofilm and pathogens in internal fluid pathways that could contaminate blood circuits and cause bloodstream infections in subsequent patients.

Question 41: Which is the most common cause of chronic kidney failure in the US?

• Hypertension
• Polycystic kidney smaller molecular disease
• Diabetes (Correct answer)
• Glomerulonephritis

Correct answer: Diabetes

Diabetes is the leading cause of chronic kidney disease (CKD) and end-stage renal disease (ESRD) in the United States. High blood sugar levels over time damage the small blood vessels in the kidneys, impairing their ability to filter waste from the blood. Managing diabetes effectively is crucial for preventing or slowing the progression of kidney failure.

Question 42: At minimum, how frequently should dialysis water be tested for bacteriological contamination according to AAMI guidelines?

• Monthly (Correct answer)
• Quarterly
• Weekly
• Daily

Correct answer: Monthly

AAMI guidelines require bacteriological testing of dialysis water at least once per month. Monthly monitoring ensures that any microbial growth in the distribution loop or storage tank is detected before bacterial counts rise to levels that could cause patient infections or pyrogenic reactions.

Question 43: The Centers for Medicare & Medicaid Services (CMS) plays what critical role in dialysis facilities?

• It sets quality and safety standards that facilities must meet to receive reimbursement. (Correct answer)
• It directly hires and trains all dialysis nurses and technicians.
• It provides continuing education credits for technicians.
• It manufactures dialysis machines and supplies.

Correct answer: It sets quality and safety standards that facilities must meet to receive reimbursement.

CMS is the federal agency that administers Medicare. For a dialysis facility to be paid for treating patients, it must be certified by CMS, which involves meeting extensive regulations regarding patient care, safety, and outcomes.

Question 44: Which reagent is used in the standard colorimetric test to check for free chlorine residual in dialysis water?

• DPD (N,N-diethyl-p-phenylenediamine) (Correct answer)
• Phenolphthalein
• Orthotoluidine
• Sodium thiosulfate

Correct answer: DPD (N,N-diethyl-p-phenylenediamine)

DPD reacts with free chlorine to produce a pink-to-red color, allowing a rapid and accurate colorimetric measurement. It is the AAMI-recommended method for verifying that carbon tank effluent meets the safe chlorine limit (≤0.1 mg/L) before dialysis begins.

Question 45: Which of the following best describes the purpose of pressure testing a dialyzer during reprocessing?

• To measure ultrafiltration rate
• To check the blood pump segment for cracks
• To confirm the dialysate flow path is patent
• To verify membrane integrity and detect fiber bundle leaks (Correct answer)

Correct answer: To verify membrane integrity and detect fiber bundle leaks

Pressure testing during reprocessing verifies the integrity of the dialyzer membrane. A drop in pressure indicates that fibers are broken or leaking, which would allow blood and dialysate to mix during treatment—a serious patient safety risk.

Question 46: What is the recommended action if there is an air embolism during dialysis?

• Continue dialysis
• Administer oxygen
• Place the patient in Trendelenburg position (Correct answer)
• Increase blood flow rate

Correct answer: Place the patient in Trendelenburg position

In the event of an air embolism during dialysis, placing the patient in the Trendelenburg position (head down, feet up) on their left side is a critical intervention. This position helps to trap air in the right ventricle, preventing it from entering the pulmonary circulation and reducing the risk of air traveling to the brain or lungs, allowing time for the air to be absorbed or aspirated.

Question 47: What does a failed pressure test during dialyzer reprocessing indicate?

• A leak in the dialyzer membrane (Correct answer)
• The dialyzer is excessively clotted
• There is residual sterilant present
• The TCV is too low for reuse

Correct answer: A leak in the dialyzer membrane

A pressure test, or leak test, checks the integrity of the hollow fiber membrane. If the dialyzer cannot hold a set pressure, it signifies a leak, which could allow non-sterile dialysate to mix with the patient's blood, posing a significant risk of infection and blood loss.

Question 48: According to AAMI RD52, what is the maximum allowable level of bacteria in dialysate?

• 500 CFU's
• 50 CFU's
• 1,000 CFU's
• 200 CFU's (Correct answer)

Correct answer: 200 CFU's

According to the Association for the Advancement of Medical Instrumentation (AAMI) RD52 standards, the maximum allowable level of bacteria in dialysate is 200 Colony Forming Units (CFU's) per milliliter. Adhering to this standard is vital to minimize the risk of bacterial contamination and prevent infections or pyrogenic reactions in hemodialysis patients.

Question 49: A dialysis facility's monthly water culture result shows a bacterial count of 75 CFU/mL. What action is required?

• No action needed; this is within AAMI acceptable limits
• This exceeds the maximum limit (200 CFU/mL) and patient treatments must be halted immediately
• This exceeds the action level (50 CFU/mL) and requires investigation, corrective action, and resampling (Correct answer)
• Increase the frequency of water testing to weekly and continue patient treatments

Correct answer: This exceeds the action level (50 CFU/mL) and requires investigation, corrective action, and resampling

A bacterial count of 75 CFU/mL exceeds the AAMI action level of 50 CFU/mL but is below the maximum limit of 200 CFU/mL. This requires a formal investigation, corrective action (such as system disinfection), and re-testing to confirm the count returns below the action level.

Question 50: A patient on a reuse program develops fever and rigors during dialysis using a reprocessed dialyzer. What is the most likely cause related to the reprocessing process?

• Hemolysis from excess anticoagulation
• Inadequate ultrafiltration from reduced TCV
• Air embolism from improper priming of the dialyzer
• Pyrogenic reaction from bacterial endotoxins in the dialyzer (Correct answer)

Correct answer: Pyrogenic reaction from bacterial endotoxins in the dialyzer

Fever and rigors during dialysis with a reprocessed dialyzer suggest a pyrogenic reaction caused by bacterial endotoxins (lipopolysaccharides) contaminating the dialyzer. This can occur if reprocessing water quality was substandard or if biofilm developed in the dialyzer.

Question 51: What is the CCHT's responsibility when a patient expresses dissatisfaction with their care during treatment?

• Immediately involve the facility administrator
• Listen empathetically, acknowledge their concerns, involve the charge nurse, and document the complaint and response (Correct answer)
• Ignore minor complaints to avoid disrupting treatment
• Tell the patient the facility policy is non-negotiable

Correct answer: Listen empathetically, acknowledge their concerns, involve the charge nurse, and document the complaint and response

Patient complaints must be acknowledged respectfully, escalated to the charge nurse for resolution, and documented to track care quality and ensure follow-through.

Question 52: Which of the following is an important step before starting dialysis?

• Check for leaks
• Verify patient weight
• Ensure air detectors are functioning
• All of the above (Correct answer)

Correct answer: All of the above

Before starting dialysis, it is crucial to perform a comprehensive safety check to ensure patient safety and effective treatment. Verifying the patient's weight is essential for accurate ultrafiltration goals, checking for leaks in the circuit prevents blood loss and contamination, and ensuring air detectors are functioning properly prevents life-threatening air embolisms. All these steps are vital for a safe and successful dialysis session.

Question 53: What is the primary purpose of the Total Cell Volume (TCV) or Fiber Bundle Volume (FBV) test during dialyzer reprocessing?

• To confirm the integrity of the dialyzer membrane and check for leaks
• To check for residual sterilant in the dialyzer
• To verify the patient's name is correctly matched to the dialyzer
• To ensure the dialyzer can still effectively clear waste products (Correct answer)

Correct answer: To ensure the dialyzer can still effectively clear waste products

The TCV test measures the internal volume of the hollow fibers. A significant drop in TCV, typically below 80% of the original volume, indicates that clotting or protein deposits have blocked too many fibers, reducing the dialyzer's surface area and its ability to provide adequate clearance of waste products.

Question 54: Which component of the dialysis machine is responsible for controlling the flow of blood through the dialyzer?

• Air detector
• Blood pump (Correct answer)
• Dialysate pump
• Ultrafiltration pump

Correct answer: Blood pump

The blood pump is the component of the dialysis machine responsible for drawing the patient's blood from their vascular access and propelling it through the extracorporeal circuit, including the dialyzer. It ensures a consistent and controlled flow rate, which is essential for efficient waste removal and fluid management during the dialysis treatment. Without the blood pump, blood would not circulate through the system.

Question 55: Chloramine is particularly dangerous in dialysis water because it can cause which serious complication?

• Aluminum toxicity from chloramine-aluminum complexes
• Hyperphosphatemia from chlorine interference with phosphate binders
• Hemolytic anemia from oxidative damage to red blood cell membranes (Correct answer)
• Hypercalcemia from displacement of calcium by chlorine

Correct answer: Hemolytic anemia from oxidative damage to red blood cell membranes

Chloramine (a combination of chlorine and ammonia used as a disinfectant in municipal water supplies) cannot be removed by reverse osmosis and can cross the dialyzer membrane to enter the patient's blood, causing oxidative damage to red blood cell membranes and hemolytic anemia.

Question 56: What is the purpose of testing dialysis water for endotoxins?

• To detect bacterial cell wall fragments that can cause inflammatory reactions even in the absence of live bacteria (Correct answer)
• To measure the total dissolved solids that might interfere with dialysate mixing
• To assess the effectiveness of chloramine removal by the carbon tanks
• To confirm the water is free of aluminum and heavy metals

Correct answer: To detect bacterial cell wall fragments that can cause inflammatory reactions even in the absence of live bacteria

Endotoxins are lipopolysaccharides derived from gram-negative bacterial cell walls. Even dead bacteria release endotoxins. When endotoxins enter the bloodstream via the dialysate, they trigger immune responses causing fever, hypotension, and systemic inflammation—even without live bacterial infection.

Question 57: What action should a technician take if the air detector alarm activates during hemodialysis?

• Increase the blood pump speed
• Remove the patient from the circuit gently
• Clamp the venous line and stop the blood pump immediately (Correct answer)
• Silence the alarm and continue treatment

Correct answer: Clamp the venous line and stop the blood pump immediately

An air detector alarm requires immediate clamping of the venous blood line and stopping the blood pump to prevent air embolism.

Question 58: What is the purpose of administering vitamin D analogs (e.g., calcitriol) to hemodialysis patients?

• Lower blood pressure
• Reduce fluid overload
• Treat metabolic acidosis
• Suppress secondary hyperparathyroidism and manage bone disease (Correct answer)

Correct answer: Suppress secondary hyperparathyroidism and manage bone disease

Active vitamin D analogs suppress parathyroid hormone (PTH) secretion to manage secondary hyperparathyroidism and renal osteodystrophy in dialysis patients.

Question 59: What is the recommended frequency for monitoring vital signs during a standard hemodialysis treatment?

• At the start, then every 30 to 60 minutes throughout treatment, and at end (Correct answer)
• At start and end of treatment only
• Every 5 minutes continuously throughout treatment
• Only when the patient reports symptoms

Correct answer: At the start, then every 30 to 60 minutes throughout treatment, and at end

KDOQI guidelines recommend vital signs at initiation and at minimum every 30 to 60 minutes during treatment to detect hemodynamic instability early.

Question 60: According to AAMI standards, what is the maximum allowable endotoxin level in water used for standard hemodialysis?

• 0.03 EU/mL
• 0.25 EU/mL
• 10 EU/mL
• 2 EU/mL (Correct answer)

Correct answer: 2 EU/mL

AAMI standards set the maximum endotoxin level at 2 EU/mL for standard dialysis water, with an action level of 1 EU/mL. Exceeding these limits puts patients at risk for pyrogenic (fever-producing) reactions during treatment.

Question 61: What is the first step in performing a patient assessment during hemodialysis?

• Assess the access site
• Check blood pressure
• Initiate dialysis treatment
• Check vital signs and overall condition (Correct answer)

Correct answer: Check vital signs and overall condition

The first step in any patient assessment, including during hemodialysis, is to establish a baseline of the patient's current physiological state. Checking vital signs (temperature, pulse, respiration, blood pressure) and observing their overall condition provides crucial information about their stability and readiness for treatment. This initial assessment helps identify any immediate concerns before proceeding with more specific checks.

Question 62: Why is dietary phosphorus restriction challenging for hemodialysis patients who require adequate protein intake?

• The phosphorus restriction only applies to plant-based protein sources
• High-protein foods are uniformly low in phosphorus, so restricting protein resolves both issues simultaneously
• Protein supplements for dialysis patients contain high phosphorus levels that cannot be avoided
• Phosphorus and protein are co-located in many foods, so restricting phosphorus often reduces protein intake below recommended levels (Correct answer)

Correct answer: Phosphorus and protein are co-located in many foods, so restricting phosphorus often reduces protein intake below recommended levels

Protein-rich foods (meat, dairy, eggs, legumes) are also naturally high in phosphorus. Restricting dietary phosphorus often leads to reduced protein intake, creating a tension between two essential dietary goals: adequate protein (≥1.0 g/kg/day) and phosphorus restriction (<800–1000 mg/day).

Question 63: What is a common complication of central venous catheters?

• Skin rash
• High blood pressure
• Infection (Correct answer)
• Blood clots

Correct answer: Infection

Infection is a common and serious complication of central venous catheters, particularly non-tunneled ones. Because the catheter provides a direct pathway for bacteria into the bloodstream, the external segment and insertion site are vulnerable to colonization, leading to local infections or potentially life-threatening bloodstream infections (sepsis). Strict aseptic technique is crucial to minimize this risk.

Question 64: Which type of hemodialysis vascular access carries the highest risk of bloodstream infection?

• Synthetic arteriovenous graft
• Native arteriovenous fistula
• Tunneled cuffed central venous catheter (Correct answer)
• Subcutaneous port-catheter device

Correct answer: Tunneled cuffed central venous catheter

Tunneled cuffed central venous catheters (CVCs) have the highest infection risk among hemodialysis accesses because the catheter provides a direct conduit from the skin surface into the central venous system, bypassing natural skin and vascular barriers. Native AV fistulas have the lowest infection rates and are the preferred access.

Question 65: The technician's permitted responsibilities mostly depend on the ______.

• state regulations/standards of practice. (Correct answer)
• Centers for Medicare & Medicaid Services guidelines.
• dialysis center guidelines.
• technician’s training.

Correct answer: state regulations/standards of practice.

The tasks that the technician is permitted to perform are generally governed by state laws and professional norms of conduct. Despite the fact that trained technicians should get comparable training, several states forbid cannulating accesses and giving intravenous heparin to technicians. Always be aware of what is legal in the state where you are working, as a technician. Even if a state permits a technician to perform specific tasks (such giving heparin injections), a dialysis facility may further limit the technician's function.

Question 66: Before returning a reprocessed dialyzer to a patient, which test must be performed to ensure patient safety?

• Germicide residual test (Correct answer)
• Ultrafiltration coefficient verification
• Dialysate conductivity test
• Blood leak detector calibration

Correct answer: Germicide residual test

A germicide residual test must be performed to confirm that germicide levels in the dialyzer are below the safe threshold before use. Exposing a patient to residual germicide can cause serious adverse reactions including hemolysis and cardiovascular compromise.

Question 67: According to AAMI standards, a reprocessed dialyzer must be discarded if its fiber bundle volume (FBV) drops below what percentage of its original measured volume?

• 90%
• 80% (Correct answer)
• 70%
• 75%

Correct answer: 80%

The Association for the Advancement of Medical Instrumentation (AAMI) sets the standard that a reprocessed dialyzer must retain at least 80% of its original TCV/FBV. If the volume drops below this threshold, the dialyzer has lost too much surface area to provide an adequate treatment and must be discarded.

Question 68: What is the correct angle at which to cannulate a fistula?

• 10-15 degrees
• 35-45 degrees
• 25-35 degrees (Correct answer)
• It doesn't matter

Correct answer: 25-35 degrees

Cannulating a fistula at an angle of 25-35 degrees is recommended to ensure proper needle placement within the vessel lumen without puncturing the back wall. This angle allows for smooth entry and minimizes trauma to the vessel, which is crucial for preserving the long-term patency and function of the fistula. Incorrect angles can lead to complications such as hematoma, infiltration, or damage to the access.

Question 69: What does the term residual chloramine testing refer to and why must it be performed before every dialysis run?

• Testing for calcium and magnesium residue from previous sessions
• Testing for residual heparin in the blood lines
• Testing for chloramines remaining in dialysate water that could cause hemolysis if present above 0.1 mg/L (Correct answer)
• Testing for chemical residue left by dialyzer reprocessing agents

Correct answer: Testing for chloramines remaining in dialysate water that could cause hemolysis if present above 0.1 mg/L

Chloramines are added to municipal water for disinfection and can cause life-threatening hemolysis if not completely removed; testing before each run confirms adequate removal.

Question 70: What is the correct method to assess an AV fistula?

• Flush with saline
• Palpate for thrill and listen for bruit (Correct answer)
• Check for pain response
• Measure blood flow with a cuff

Correct answer: Palpate for thrill and listen for bruit

Assessing an AV fistula involves both palpation and auscultation to confirm its patency and function. A 'thrill' is a palpable vibration felt over the fistula, indicating blood flow, and a 'bruit' is a whooshing sound heard with a stethoscope, also confirming adequate blood flow. The presence of a strong thrill and bruit indicates a healthy, functioning fistula.

Question 71: Which of the following is a role for the networks for end-stage renal disease?

• Help resolve patient-staff conflicts. (Correct answer)
• Set Centers for Medicare & Medicaid Services standards of care.
• Pay for patient services.
• Provide the pay-for-performance program.

Correct answer: Help resolve patient-staff conflicts.

The End-Stage Renal Disease (ESRD) Networks assist centers in resolving issues involving patients and staff. Congress established 18 ESRD Networks across the nation in order to guarantee the provision of high-quality dialysis care. Medicare has contracts with the ESRD Networks to gather information, provide reports, support rehabilitation, implement improvement projects, and offer resources to patients and medical professionals. Working with ESRD Networks is a requirement for all dialysis facilities.

Question 72: Which of the following should be monitored regularly during hemodialysis?

• Respiratory rate only
• Blood pressure, heart rate, and oxygen saturation (Correct answer)
• Body temperature only
• Blood glucose levels only

Correct answer: Blood pressure, heart rate, and oxygen saturation

During hemodialysis, patients are at risk for various complications, particularly fluid shifts and cardiovascular instability. Regularly monitoring blood pressure, heart rate, and oxygen saturation provides essential real-time data on the patient's hemodynamic status and respiratory function. These vital signs help detect adverse reactions like hypotension or hypoxemia early, allowing for timely intervention.

Question 73: During hemodialysis, a patient suddenly becomes confused and short of breath, and the technician observes foam or bubbles in the venous blood line. Which complication should be suspected?

• Hypertensive urgency
• Air embolism (Correct answer)
• Hypoglycemia
• Hemolysis

Correct answer: Air embolism

Visible air or foam in the venous blood line combined with acute neurological changes and respiratory distress are classic signs of air embolism, a life-threatening emergency requiring immediate clamp of the venous line and positional management.

Question 74: Which electrolyte is most commonly removed during hemodialysis?

• Potassium (Correct answer)
• Sodium
• Calcium
• Chloride

Correct answer: Potassium

Potassium is a critical electrolyte that accumulates in patients with kidney failure because their kidneys are unable to excrete it effectively. High potassium levels (hyperkalemia) can be life-threatening due to its profound effects on heart rhythm, potentially causing cardiac arrest. Hemodialysis effectively removes excess potassium to maintain a safe balance.

Question 75: What is the role of the reverse osmosis (RO) unit in the dialysis water treatment system?

• To neutralize chloramines that were not removed by the activated carbon tanks
• To sterilize the water by ultraviolet irradiation before distribution to dialysis machines
• To remove the majority of dissolved solutes, bacteria, and endotoxins from the pretreated water (Correct answer)
• To add necessary minerals and electrolytes to the purified water for dialysate preparation

Correct answer: To remove the majority of dissolved solutes, bacteria, and endotoxins from the pretreated water

The reverse osmosis unit is the primary purification step, removing 90–99% of dissolved solutes (including toxic metals, bacteria, viruses, and endotoxins) through membrane filtration under high pressure. It produces the ultrapure water required for dialysate preparation.

Question 76: A dialysis patient's hemoglobin is 8.2 g/dL and the reticulocyte count is low. What is the most likely cause of this finding?

• Decreased erythropoiesis due to inadequate ESA dose or functional iron deficiency (Correct answer)
• Functional iron deficiency with adequate erythropoietin response
• Iron deficiency anemia from blood loss
• Hemolytic anemia from dialysis membrane reaction

Correct answer: Decreased erythropoiesis due to inadequate ESA dose or functional iron deficiency

A low hemoglobin with a low reticulocyte count suggests the bone marrow is not producing sufficient red blood cells. In dialysis patients, this pattern most commonly indicates inadequate ESA dosing, functional iron deficiency (insufficient iron for erythropoiesis despite adequate stores), or pure red cell aplasia.

Question 77: Which chemical is most commonly used as the sterilant/disinfectant in modern dialyzer reprocessing systems?

• Peracetic Acid (Correct answer)
• Glutaraldehyde
• Formaldehyde
• Sodium Hypochlorite

Correct answer: Peracetic Acid

Peracetic acid (PAA) is a widely used high-level disinfectant and sterilant in dialyzer reprocessing. It is effective against a broad spectrum of microorganisms, including bacteria, viruses, and spores, and it breaks down into non-toxic byproducts (acetic acid and oxygen).

Question 78: A patient's blood pressure drops from 148/88 mmHg at treatment start to 82/50 mmHg at 90 minutes into dialysis. Which parameter should the technician check first?

• The ultrafiltration rate and total volume removed so far (Correct answer)
• The dialysate temperature setting
• The dialysate potassium concentration
• The blood flow rate accuracy

Correct answer: The ultrafiltration rate and total volume removed so far

A sudden significant drop in blood pressure during dialysis is most commonly caused by aggressive ultrafiltration (removing fluid faster than the vascular refilling rate). The technician should immediately check the ultrafiltration rate and the volume already removed to determine if over-ultrafiltration is the cause.

Question 79: What is the clinical significance of a decreasing Kt/V trend over multiple treatments despite no changes in dialysis prescription?

• May indicate access dysfunction, fistula recirculation, shortened treatment times, or increasing patient size (Correct answer)
• The dialysis machine needs recalibration
• Patient is improving and requires less dialysis
• Normal variation that does not require investigation

Correct answer: May indicate access dysfunction, fistula recirculation, shortened treatment times, or increasing patient size

A declining Kt/V without prescription changes suggests access problems (stenosis, recirculation), non-compliance with treatment time, or patient body composition changes requiring evaluation.

Question 80: In the context of dialysis adequacy, what does Kt/V represent?

• A measure of the patient's blood pressure and volume status.
• The rate of ultrafiltration during treatment.
• A calculation involving clearance, time, and volume to measure dose of dialysis. (Correct answer)
• Potassium (K) and total (t) volume (V).

Correct answer: A calculation involving clearance, time, and volume to measure dose of dialysis.

Kt/V is a measure of dialysis adequacy. 'K' represents the dialyzer's clearance of urea, 't' is the treatment time, and 'V' is the patient's total body water volume. The formula provides a measure of the 'dose' of dialysis delivered.

Question 81: What is the first-line intervention for a patient experiencing first-use syndrome during hemodialysis?

• Increase ultrafiltration to remove the offending substances
• Switch to a different dialyzer type without stopping treatment
• Stop dialysis, clamp and discard blood lines, administer antihistamine and notify physician (Correct answer)
• Continue treatment as the reaction is mild and self-limiting

Correct answer: Stop dialysis, clamp and discard blood lines, administer antihistamine and notify physician

First-use syndrome (Type A anaphylactic reaction) requires immediate treatment discontinuation with blood discarded (not returned), antihistamine administration, and physician notification.

Question 82: Which of the following should be used to disinfect dialysis equipment?

• Bleach
• Soap and water
• An approved chemical disinfectant (Correct answer)
• Rubbing alcohol

Correct answer: An approved chemical disinfectant

Dialysis equipment requires specific, approved chemical disinfectants that are effective against a broad spectrum of microorganisms, including bloodborne pathogens, and are compatible with the machine's materials. These disinfectants are chosen based on their proven efficacy and safety profiles to ensure thorough decontamination without damaging the sensitive equipment.

Question 83: Before a reprocessed dialyzer is used for a patient's treatment, what is the most critical final check that must be performed at the patient's station?

• Testing for residual sterilant (Correct answer)
• Checking the external casing for cracks
• Confirming the original prime volume
• Verifying the TCV is above 90%

Correct answer: Testing for residual sterilant

It is absolutely critical to ensure that no residual sterilant remains in the dialyzer before it is connected to the patient. Exposure to even small amounts of chemicals like peracetic acid can cause serious adverse reactions, including hemolysis and anaphylaxis. This is tested for right before use.

Question 84: How does single-needle dialysis differ from standard two-needle hemodialysis?

• It uses one needle for access and relies on peritoneal membranes for diffusion
• It is only used for patients with central venous catheters
• It requires a higher blood flow rate to compensate for single access
• It alternates blood withdrawal and return through a single needle using a dual-lumen approach (Correct answer)

Correct answer: It alternates blood withdrawal and return through a single needle using a dual-lumen approach

Single-needle dialysis uses one needle or dual-lumen catheter, alternating between drawing blood out and returning it, reducing efficiency compared to standard two-needle access.

Question 85: What is the purpose of the deaeration chamber system in a hemodialysis machine?

• Remove dissolved gases from dialysate before patient contact (Correct answer)
• Cool the dialysate to proper temperature
• Remove bacteria from dialysate
• Measure dialysate flow rate

Correct answer: Remove dissolved gases from dialysate before patient contact

The deaeration system removes dissolved gases (primarily CO2 and O2) from dialysate to prevent microbubble formation that could damage the dialyzer membrane.

Question 86: What information must be documented on the label of a reprocessed dialyzer?

• Nurse's initials, reuse count, and TCV percentage
• Patient name or ID, reuse count, and date of last reprocessing (Correct answer)
• Physician name, germicide concentration, and date of first use
• Patient name, dialyzer model number, and germicide brand name

Correct answer: Patient name or ID, reuse count, and date of last reprocessing

Reprocessed dialyzer labels must include the patient identifier, the reuse count, and the date of the most recent reprocessing. This information is essential for tracking and verifying the dialyzer is correctly matched to the patient and within policy limits.

Question 87: What is a pseudoaneurysm (false aneurysm) of an arteriovenous fistula, and how does it differ from a true aneurysm?

• They are clinically identical and managed the same way
• Pseudoaneurysm is a pulsatile hematoma outside the vessel wall contained by fibrous tissue; true aneurysm involves all wall layers (Correct answer)
• Pseudoaneurysm involves all three vessel wall layers; true aneurysm is contained by fibrous tissue only
• Pseudoaneurysms only occur in arteriovenous grafts

Correct answer: Pseudoaneurysm is a pulsatile hematoma outside the vessel wall contained by fibrous tissue; true aneurysm involves all wall layers

A pseudoaneurysm results from a vessel wall defect with blood escaping into tissue and being contained by a fibrous capsule, not the actual vessel wall layers.

Question 88: What does the conductivity test of dialysate measure, and why is it important?

• The pH of the dialysate to prevent acid-base disturbances in patients
• The bacterial load of the dialysate to detect contamination
• The temperature of the dialysate to ensure patient comfort
• The total dissolved solute concentration of the dialysate, confirming correct electrolyte mixing (Correct answer)

Correct answer: The total dissolved solute concentration of the dialysate, confirming correct electrolyte mixing

Dialysate conductivity measures the total ionic concentration of the dialysate, which serves as a proxy for correct electrolyte composition (sodium, potassium, calcium, magnesium, bicarbonate). It confirms that concentrate and water are being mixed at the correct proportions.

Question 89: Which parameter is commonly monitored for water quality in dialysis?

• Color
• Conductivity (Correct answer)
• Odor
• Bubbles

Correct answer: Conductivity

Conductivity is a critical parameter monitored for water quality in dialysis because it measures the total ionic concentration of the water. High or low conductivity indicates the presence of impurities or incorrect mineral levels, which can be harmful to patients during treatment. Maintaining precise conductivity ensures the dialysate is safe and effective.

Question 90: What is the function of a deionizer (DI unit) in a dialysis water treatment system?

• Exchange cations and anions in water for hydrogen and hydroxyl ions, producing highly purified water (Correct answer)
• Remove residual chlorine through catalytic reduction
• Kill microorganisms by exposing water to high-intensity ultraviolet light
• Reduce water pressure to a safe level before it enters the RO membrane

Correct answer: Exchange cations and anions in water for hydrogen and hydroxyl ions, producing highly purified water

A deionizer contains mixed-bed ion exchange resin that replaces dissolved cations (e.g., sodium, calcium) with H⁺ ions and dissolved anions (e.g., chloride, sulfate) with OH⁻ ions. The H⁺ and OH⁻ combine to form water, removing nearly all ionic contamination. Resistivity or conductivity monitoring indicates when the resin is exhausted.

Question 91: The reason potassium dialyzes and RBCs do not is:

• RBCs have a negative charge
• potassium has a smaller molecular weight (Correct answer)
• potassium has a larger molecular weight
• RBCs are not water-soluble

Correct answer: potassium has a smaller molecular weight

Dialysis works on the principle of diffusion, where solutes move across a semipermeable membrane. The size of the molecule is a critical factor in this process. Smaller molecules like potassium ions can easily pass through the pores of the dialyzer membrane, while much larger components like red blood cells (RBCs) cannot, ensuring that RBCs remain in the patient's blood.

Question 92: During dialysis, the blood leak detector alarm activates. What does this indicate and what action should be taken?

• Patient blood pressure is dropping; administer saline bolus
• Blood is crossing into the dialysate side; stop treatment and do not return blood (Correct answer)
• The arterial needle has dislodged; reinsert immediately
• The dialysate is too concentrated; dilute with water

Correct answer: Blood is crossing into the dialysate side; stop treatment and do not return blood

A blood leak detector alarm means dialyzer membrane rupture has occurred; blood must not be returned to the patient due to risk of contamination.

Question 93: The technician may divulge his or her password to ____________ if a dialysis facility uses electronic charting.

• nurse.
• no one. (Correct answer)
• nephrologist.
• supervisor.

Correct answer: no one.

When computerized charting is used at a dialysis facility, the technician shouldn't divulge their password to anyone. Each staff member who is permitted to access a patient's or patients' electronic health record should have their own password. According to the user's password, access to the records is electronically monitored. A staff member should never have access to the files of a patient for whom they are not providing care because doing so is against the Health Insurance Portability and Accountability Act of 1996.

Question 94: What is the significance of the transmembrane pressure (TMP) reading on a hemodialysis machine?

• It indicates the pressure driving fluid across the dialyzer membrane for ultrafiltration (Correct answer)
• It measures resistance in the arterial blood line
• It measures the patient's blood pressure during treatment
• It monitors the speed of the dialysate pump

Correct answer: It indicates the pressure driving fluid across the dialyzer membrane for ultrafiltration

TMP is the pressure difference across the dialyzer membrane that drives ultrafiltration (fluid removal) from the blood side to the dialysate side.

Question 95: What is the recommended angle of needle insertion when cannulating a mature arteriovenous fistula?

• 90 degrees perpendicular to the skin
• 5–10 degrees
• 25–35 degrees (Correct answer)
• 45–60 degrees

Correct answer: 25–35 degrees

A 25–35 degree insertion angle allows the needle to enter the vessel lumen cleanly without going through the back wall. Shallower angles risk staying subcutaneous, while steeper angles increase the risk of posterior wall puncture and infiltration.

Question 96: What does the conductivity monitor on a hemodialysis machine measure, and why is it critical?

• Flow rate of dialysate through the circuit
• Pressure in the venous blood line
• Temperature of the blood returning to the patient
• Concentration of electrolytes in the dialysate solution (Correct answer)

Correct answer: Concentration of electrolytes in the dialysate solution

Conductivity measures the total ionic concentration (electrolyte content) of the dialysate, ensuring the correct concentration for safe treatment.

Question 97: What action is required when a hemodialysis machine fails its required disinfection process verification test?

• Continue using the machine for stable patients only
• Use the machine for the next session and schedule maintenance for the following day
• Take the machine out of service immediately, notify biomedical engineering, and document the failure (Correct answer)
• Repeat the disinfection cycle once and proceed if the repeat passes

Correct answer: Take the machine out of service immediately, notify biomedical engineering, and document the failure

A failed disinfection verification means the machine may harbor live pathogens; it must be immediately removed from service until repaired and re-verified.

Question 98: What is the purpose of the dialyzer in the dialysis machine?

• To administer medications
• To monitor blood pressure
• To remove toxins and fluid from blood (Correct answer)
• To detect air in the blood

Correct answer: To remove toxins and fluid from blood

The dialyzer, often referred to as the artificial kidney, is the core component where the actual purification of blood takes place. It contains a semi-permeable membrane that allows waste products and excess fluid to pass from the patient's blood into the dialysate solution, while retaining essential blood cells and proteins. This process mimics the natural filtering function of healthy kidneys.

Question 99: Which of the following is most likely to increase the efficacy of hemodialysis in a dialysis patient who is very large in both stature and weight?

• Decrease treatment time.
• Change to peritoneal dialysis.
• Increase dialyzer size. (Correct answer)
• Increase salt restriction.

Correct answer: Increase dialyzer size.

An increase in the dialyzer size because it promotes the clearance of waste products is the intervention that is most likely to improve hemodialysis effectiveness in patients who are very large in both stature and weight. Based on the patient's size and the recommended length of treatment, the nephrologist determines the size of the dialyzer. Increasing the length of treatment is another technique that can improve the efficacy of hemodialysis.

Question 100: When using active listening, which of the following is a good example of a short, open-ended question to use to encourage patient communication?

• "Do you have pain?"
• "Has the pain gotten worse?"
• "What does the pain in your abdomen feel like?"
• "How would you rate your pain on a 1 to 10 scale?"

An open-ended question encourages the patient to provide more than a simple 'yes' or 'no' answer, fostering detailed communication. 'What does the pain in your abdomen feel like?' prompts the patient to describe the quality, intensity, and other characteristics of their pain, allowing the technician to gather comprehensive information and better understand their experience. This approach is crucial for active listening as it invites deeper engagement and provides valuable insights into the patient's condition.

Question 101: Which medication is used to reverse the anticoagulant effects of heparin in cases of overdose or emergency bleeding?

• Protamine sulfate (Correct answer)
• Vitamin K
• Tranexamic acid
• Fresh frozen plasma

Correct answer: Protamine sulfate

Protamine sulfate binds and neutralizes heparin, rapidly reversing its anticoagulant effect.

Question 102: What is the purpose of rotating needle insertion sites on an AV fistula?

• To make the procedure easier
• To prevent scarring and aneurysms (Correct answer)
• To avoid blood clots
• To reduce bleeding

Correct answer: To prevent scarring and aneurysms

Rotating needle insertion sites prevents repeated trauma to the same area of the AV fistula. This practice reduces the risk of scarring, which can narrow the vessel, and the formation of aneurysms, which are dangerous bulges in the vessel wall. By distributing the insertion points, the fistula's integrity is maintained, prolonging its lifespan for effective dialysis.

Question 103: A patient's tunneled catheter is found to have a blood flow rate of only 180 mL/min despite the prescription of 350 mL/min. After repositioning the patient and reversing the catheter lines, flow improves minimally. What is the likely cause and appropriate next step?

• Catheter dysfunction from fibrin sheath or intraluminal thrombus; notify the nurse for consideration of thrombolytic therapy (Correct answer)
• The catheter is kinked at the chest wall; call interventional radiology for catheter revision
• The catheter tip has migrated to the subclavian vein; reassess position with ultrasound
• Air lock in the catheter lumen; flush with normal saline using high pressure to displace the air

Correct answer: Catheter dysfunction from fibrin sheath or intraluminal thrombus; notify the nurse for consideration of thrombolytic therapy

Poor blood flow despite adequate positioning suggests catheter dysfunction from fibrin sheath formation (a layer of fibrinous material covering the catheter tip, limiting blood aspiration) or intraluminal thrombus. Thrombolytic therapy (tissue plasminogen activator, tPA) is the first-line intervention.

Question 104: The purpose of using counter-current flow is to:

• decrease the amount of dialysate used
• increase the rate of fluid removal
• decrease the surface area of the membrane
• increase the rate of waste removal (Correct answer)

Correct answer: increase the rate of waste removal

Counter-current flow in a dialyzer involves blood and dialysate flowing in opposite directions. This arrangement maintains a maximal concentration gradient across the entire length of the membrane. This continuous gradient optimizes the efficiency of diffusion, significantly increasing the rate at which waste products are removed from the patient's blood.

Question 105: Which of the following is an example of standard precautions in dialysis?

• Only using alcohol-based hand sanitizers
• Disinfecting only the patient's access site
• Wearing gloves only
• Wearing gloves and face mask during treatment (Correct answer)

Correct answer: Wearing gloves and face mask during treatment

Standard precautions are infection control practices designed to prevent the transmission of infectious agents. In dialysis, this includes wearing gloves whenever there is potential contact with blood, body fluids, non-intact skin, or contaminated equipment, and wearing a face mask and eye protection when there is a risk of splashes or sprays. These measures protect both the patient and the healthcare worker from exposure.

Question 106: A patient reports feeling dizzy and their blood pressure has dropped to 90/50 mmHg. What is the most appropriate initial intervention?

• Increase the ultrafiltration rate
• Increase the blood flow rate
• Place the patient in the Trendelenburg position (Correct answer)
• Encourage the patient to drink water

Correct answer: Place the patient in the Trendelenburg position

The symptoms and significant drop in blood pressure indicate hypotension. Placing the patient in the Trendelenburg position (feet elevated above the head) is a rapid first response that uses gravity to increase blood flow to the brain and vital organs while other interventions, like administering saline, are prepared.

Question 107: Proper labeling of a reprocessed dialyzer is crucial for patient safety. Which of the following pieces of information is required on the label?

• The name of the technician who performed the reprocessing
• The patient's date of birth
• The brand of the reprocessing machine used
• The number of previous uses (Correct answer)

Correct answer: The number of previous uses

The label on a reprocessed dialyzer must contain critical patient safety information to ensure it is used on the correct patient and is still safe for use. This includes the patient's name, the number of times it has been used, and the date of reprocessing.

Question 108: Which parameter must be verified before connecting a patient to the hemodialysis machine?

• The dialysate color and turbidity
• Blood flow rate, dialysate flow rate, temperature, and conductivity (Correct answer)
• The patient's hemoglobin level
• The machine's last service date

Correct answer: Blood flow rate, dialysate flow rate, temperature, and conductivity

All dialysis prescription parameters must be verified against the patient's prescription before treatment begins.

Question 109: What is the primary function of the bicarbonate proportioning system in modern hemodialysis machines?

• Mix acid and bicarbonate concentrates with purified water to create dialysate (Correct answer)
• Control the rate of potassium removal from blood
• Sterilize the dialysate before patient contact
• Monitor and adjust patient's serum bicarbonate levels directly

Correct answer: Mix acid and bicarbonate concentrates with purified water to create dialysate

The proportioning system precisely mixes acid concentrate (containing electrolytes) and bicarbonate concentrate with purified water in correct ratios to create dialysate.

Question 110: What is the minimum acceptable total cell volume (TCV) for a reprocessed dialyzer to be approved for reuse?

• 95% of the original TCV
• 80% of the original TCV (Correct answer)
• 70% of the original TCV
• 90% of the original TCV

Correct answer: 80% of the original TCV

AAMI guidelines require that a reprocessed dialyzer retain at least 80% of its original total cell volume (TCV). A dialyzer that falls below this threshold must be discarded because reduced fiber volume indicates inadequate clearance capability.

Question 111: What is the function of the distribution loop in the dialysis water treatment system?

• To distribute concentrated electrolytes from the proportioning system to individual dialysis machines
• To distribute backwash water from the RO reject stream to the floor drains
• To continuously circulate RO-purified water to dialysis machines, preventing stagnation and bacterial growth in supply lines (Correct answer)
• To recirculate used dialysate back through the RO system for reuse

Correct answer: To continuously circulate RO-purified water to dialysis machines, preventing stagnation and bacterial growth in supply lines

The distribution loop continuously circulates RO product water through the supply lines to all dialysis machines. Continuous circulation prevents water from becoming stagnant in the lines, which would allow bacterial biofilm to form and multiply in the piping system.

Question 112: A new patient has been identified as hepatitis C positive. What infection control precautions should be implemented in the hemodialysis unit?

• Isolate the patient in a separate room with dedicated equipment
• Cohort the patient with other HCV-positive patients and use dedicated machines (Correct answer)
• Refuse treatment until the patient completes antiviral therapy
• Follow standard precautions only; HCV is not transmitted by casual contact in dialysis

Correct answer: Cohort the patient with other HCV-positive patients and use dedicated machines

CDC recommends cohorting HCV-positive patients in a dedicated area or machine due to hemodialysis-specific transmission risks, in addition to standard precautions.

Question 113: Which of the following foods is highest in potassium and should be limited by most hemodialysis patients?

• White rice
• Potatoes (Correct answer)
• Green beans
• Apples

Correct answer: Potatoes

Potatoes, especially when cooked with the skin, are very high in potassium. Hemodialysis patients often have difficulty excreting potassium, which can lead to dangerous hyperkalemia, so high-potassium foods are typically restricted.

Question 114: What are the three main types of vascular access used in hemodialysis?

• Vein puncture, artery puncture, and catheter
• Arteriovenous fistula, AV graft, and central venous catheter (Correct answer)
• Artery clamp, vein valve, and graft
• Subcutaneous port, AV valve, and shunt

Correct answer: Arteriovenous fistula, AV graft, and central venous catheter

The three main types of vascular access used in hemodialysis are the arteriovenous (AV) fistula, the AV graft, and the central venous catheter. An AV fistula is a surgical connection between an artery and a vein, an AV graft uses a synthetic tube to connect them, and a central venous catheter is a tube inserted into a large central vein. Each type has distinct advantages and disadvantages for long-term or temporary use.

Question 115: What is the primary mechanism by which a reverse osmosis (RO) system purifies dialysis water?

• Activated carbon adsorption of heavy metals and ions
• Ion exchange resin that traps dissolved minerals
• Forcing water through a semi-permeable membrane under pressure, rejecting 90–99% of dissolved solutes (Correct answer)
• Ultraviolet light that breaks down organic contaminants

Correct answer: Forcing water through a semi-permeable membrane under pressure, rejecting 90–99% of dissolved solutes

The RO system uses hydraulic pressure to push water through a semi-permeable membrane. The membrane's pore size is small enough to reject most dissolved ions, organics, bacteria, and endotoxins, producing highly purified product water while concentrating contaminants in a reject stream.

Question 116: To reinforce teaching, the technician should remind patients with kidney failure that they should avoid ___________.

• having X-rays taken
• taking acetaminophen
• exercising
• smoking (Correct answer)

Correct answer: smoking

Smoking is highly detrimental to overall health, especially for patients with kidney failure. It further damages blood vessels, exacerbates cardiovascular disease (a common comorbidity in ESRD), and can accelerate the progression of kidney disease. Technicians should strongly reinforce the importance of avoiding smoking to improve patient outcomes and quality of life.

Question 117: Why should blood pressure and venipuncture be avoided in the arm with an AV fistula?

• To improve circulation
• Because it’s painful
• To avoid damaging the fistula (Correct answer)
• To reduce fluid buildup

Correct answer: To avoid damaging the fistula

Blood pressure measurements and venipuncture should be avoided in the arm with an AV fistula to prevent damage to the delicate vascular access. Compressing or puncturing the fistula can lead to thrombosis, infection, or loss of patency, which would compromise the patient's ability to receive life-sustaining dialysis treatments. Preserving the fistula's integrity is paramount.

Question 118: What should you check after dialysis has finished?

• All of the above (Correct answer)
• Dispose of dialysis equipment
• Check for signs of bleeding (Correct answer)
• Ensure the patient is stable

Correct answer: All of the above

After dialysis has finished, it is critically important to check for signs of bleeding, particularly at the vascular access site. Anticoagulants used during the treatment can increase the risk of post-dialysis bleeding. While ensuring patient stability and proper equipment disposal are also important, actively monitoring for bleeding is a direct safety measure to prevent immediate complications.

Question 119: What is the purpose of conducting monthly water quality testing in a hemodialysis facility?

• To test for heavy metals only once per year
• To ensure treated water meets AAMI chemical and microbiological standards and prevent patient harm from contaminated dialysate (Correct answer)
• To verify municipal water supply compliance
• To determine water billing costs

Correct answer: To ensure treated water meets AAMI chemical and microbiological standards and prevent patient harm from contaminated dialysate

Monthly water quality testing ensures the water treatment system is functioning correctly and that dialysate water meets AAMI standards, protecting patients from chemical and microbiological contamination.

Question 120: If a patient complains of persistent itching, which of the following nonprescription methods may help relieve symptoms?

• Apply rubbing alcohol
• Avoid bathing
• Take oatmeal baths (Correct answer)
• Take cold showers

Correct answer: Take oatmeal baths

Persistent itching (pruritus) is a common and distressing symptom in patients with kidney failure, often due to uremic toxins. Oatmeal baths are a widely recognized nonprescription method that can help soothe irritated skin and relieve itching. The colloidal oatmeal has anti-inflammatory and moisturizing properties that can provide comfort and alleviate discomfort.

Question 121: What should be checked before starting dialysis treatment?

• Review the patient's medication history
• Check if the patient has eaten recently
• Ensure stability and equipment readiness (Correct answer)
• Verify the patient's insurance details

Correct answer: Ensure stability and equipment readiness

Before initiating dialysis treatment, it is paramount to ensure both patient stability and equipment readiness. This involves verifying the patient's vital signs and overall condition are suitable for treatment, and meticulously checking that the dialysis machine, lines, and dialyzer are correctly assembled, primed, and functioning properly. This comprehensive check minimizes risks and ensures a safe and effective treatment session.

Question 122: A patient develops cardiac arrhythmia with a wide QRS complex during dialysis. Serum potassium is 6.5 mEq/L. What is the priority intervention?

• Administer oral potassium binders and continue dialysis as planned
• Increase the dialysate flow rate to speed potassium removal
• Stop treatment and send the patient to the emergency department
• Notify the physician immediately, obtain 12-lead ECG, and prepare for potential emergency interventions (Correct answer)

Correct answer: Notify the physician immediately, obtain 12-lead ECG, and prepare for potential emergency interventions

Cardiac arrhythmia with hyperkalemia is a life-threatening emergency requiring immediate physician notification, cardiac monitoring, and readiness for emergency interventions.

Question 123: A patient should be taught that which of the following activities should be avoided in their access arm?

• Elevating the arm on a pillow
• Gently washing the arm with soap and water
• Having their blood pressure taken (Correct answer)
• Performing light exercises like squeezing a ball

Correct answer: Having their blood pressure taken

To protect the vascular access, patients should be taught to avoid anything that could compress the blood vessels and cause clotting or damage. This includes having blood pressure taken, wearing tight clothing or jewelry, and having blood drawn from that arm for routine lab work.

Question 124: What is the recommended method for assessing blood flow during hemodialysis?

• By feeling the pulse at the access site
• By monitoring the dialysate return
• By observing the venous pressure
• By measuring the blood flow rate

The most direct and recommended method for assessing blood flow during hemodialysis is by measuring the blood flow rate, which is set and displayed on the dialysis machine. This rate indicates how much blood is being processed per minute through the dialyzer. While other assessments like venous pressure or feeling a thrill are important for access patency, the machine's blood flow rate is the primary parameter for monitoring the efficiency of blood processing.

Question 125: Under CMS regulations, all dialysis patients have the right to:

• Be informed about their treatment plan and participate in its development. (Correct answer)
• Receive treatment at any time of day they choose.
• Refuse to be weighed before or after treatment.
• Demand a specific technician for every treatment.

Correct answer: Be informed about their treatment plan and participate in its development.

CMS Conditions for Coverage for End-Stage Renal Disease Facilities emphasize patient rights, including the right to be fully informed about all aspects of their care. This includes active participation in the development and implementation of their individual plan of care.

Question 126: The primary purpose of the Health Insurance Portability and Accountability Act (HIPAA) is to:

• Regulate the quality of dialysis care.
• Ensure proper billing and coding for Medicare.
• Set standards for workplace safety.
• Protect the privacy and security of patient health information. (Correct answer)

Correct answer: Protect the privacy and security of patient health information.

HIPAA's Privacy Rule establishes national standards to protect individuals' medical records and other personal health information (PHI). It sets limits and conditions on the uses and disclosures of such information.

Question 127: A dialysis patient's hemoglobin rises above 13 g/dL while on ESA therapy. What is the appropriate action?

• Add an oral iron supplement
• Discontinue ESA and monitor
• Increase the ESA dose
• Reduce or hold the ESA dose (Correct answer)

Correct answer: Reduce or hold the ESA dose

ESA dose should be reduced or held when hemoglobin exceeds target levels (typically >13 g/dL) to avoid increased cardiovascular risk associated with high hemoglobin.

Question 128: What is the physiological consequence of using dialysate with a calcium concentration lower than the patient's serum calcium?

• Phosphorus will increase to compensate for calcium loss
• Calcium will move from blood into dialysate, potentially lowering serum calcium (Correct answer)
• No change occurs because calcium does not cross the dialyzer membrane
• Calcium will move from dialysate into blood, raising serum calcium

Correct answer: Calcium will move from blood into dialysate, potentially lowering serum calcium

When dialysate calcium is lower than serum calcium, the concentration gradient causes calcium to diffuse out of the blood into the dialysate, lowering serum levels.

Question 129: During the reprocessing procedure, what is the purpose of the 'reverse ultrafiltration' step?

• To measure the total cell volume of the blood compartment
• To test for leaks in the membrane by applying positive pressure
• To force cleaning agents from the dialysate compartment to the blood compartment (Correct answer)
• To sterilize the outside of the dialyzer casing

Correct answer: To force cleaning agents from the dialysate compartment to the blood compartment

Reverse ultrafiltration pushes fluid (water and cleaning agents) in the opposite direction of normal dialysis flow, from the dialysate compartment into and through the blood compartment. This helps to dislodge and flush out protein deposits and blood residue from the inner surface of the hollow fiber membranes, ensuring a more thorough cleaning.

Question 130: How many consecutive cannulations are typically necessary to form a buttonhole tract before it is sufficiently formed?

• 5 to 8.
• 4 to 5.
• 8 to 10. (Correct answer)
• 10 to 12.

Correct answer: 8 to 10.

Usually 8 to 10 consecutive cannulations are needed to establish a buttonhole tract before it is complete. It is crucial that the same individual do the cannulations throughout this development phase because doing so increases the likelihood that the same angle will be applied each time. Grafts cannot be operated on using the buttonhole technique because they lack the muscle fibers that constrict around the tract once the needle is removed.

Question 131: With uremia, as waste products build up in the blood, this can result in _____________.

• ammonia breath (Correct answer)
• rash
• ringing in the ears
• abdominal pain

Correct answer: ammonia breath

Uremia is a condition where waste products, particularly urea, build up in the blood due to kidney failure. One characteristic symptom of severe uremia is ammonia breath, also known as uremic fetor. This distinctive odor results from the breakdown of urea into ammonia in the saliva, indicating a significant accumulation of toxins in the body.

Question 132: Which of the following best describes the function of the outflow vein in an arteriovenous graft (AVG)?

• The outflow vein is used for the arterial needle placement
• The outflow vein carries high-pressure arterial blood away from the graft anastomosis toward the heart (Correct answer)
• The outflow vein regulates access blood flow
• The outflow vein carries dialyzed blood from the venous needle back to the patient

Correct answer: The outflow vein carries high-pressure arterial blood away from the graft anastomosis toward the heart

The outflow vein carries blood from the venous graft anastomosis toward the heart; it receives high-pressure arterial flow and is the most common site of stenosis in AVGs.

Question 133: In chronic kidney disease, what is the typical relationship between serum calcium and serum phosphorus levels before treatment?

• Both are typically low.
• Both are typically high.
• Calcium is high, and phosphorus is low.
• Calcium is low, and phosphorus is high. (Correct answer)

Correct answer: Calcium is low, and phosphorus is high.

Failing kidneys are unable to excrete phosphorus effectively, leading to high serum phosphorus (hyperphosphatemia). The high phosphorus levels and lack of activated Vitamin D lead to low serum calcium (hypocalcemia).

Question 134: What is the main goal of quality control in a dialysis facility?

• Reduce staff workload
• Ensure safety and effectiveness (Correct answer)
• Shorten treatment times
• Increase patient load

Correct answer: Ensure safety and effectiveness

The main goal of quality control in a dialysis facility is to ensure the safety and effectiveness of all procedures and equipment. This involves rigorous monitoring of water quality, machine function, and patient care processes to meet regulatory standards and prevent adverse events. Ultimately, quality control safeguards patient well-being and optimizes treatment outcomes.

Question 135: In a hemodialysis patient, which combination of laboratory findings is most consistent with iron deficiency anemia?

• Low ferritin (<100 ng/mL), low TSAT (<20%), low hemoglobin, low MCV (Correct answer)
• Normal ferritin, normal TSAT, low hemoglobin, normal MCV
• High ferritin, high transferrin saturation (TSAT), low hemoglobin
• Low ferritin, high TSAT, normal hemoglobin

Correct answer: Low ferritin (<100 ng/mL), low TSAT (<20%), low hemoglobin, low MCV

Iron deficiency anemia is characterized by depleted iron stores (low ferritin), insufficient iron for transport to the marrow (low TSAT), reduced hemoglobin synthesis (low hemoglobin), and small red cells (low MCV—microcytic anemia) from inadequate hemoglobin to fill each cell.

Question 136: What is the recommended hand hygiene technique after removing gloves following patient care in a hemodialysis unit?

• Gloves provide complete protection; hand hygiene is optional after removal
• Sanitize gloves and remove them over the sink
• Only wash hands if gloves visibly tore during use
• Wash hands with soap and water or use alcohol-based hand rub immediately after glove removal (Correct answer)

Correct answer: Wash hands with soap and water or use alcohol-based hand rub immediately after glove removal

Hands must be washed or sanitized immediately after removing gloves because gloves can have micro-tears and removal itself can contaminate hands.

Question 137: Which electrolyte can accumulate due to poor phosphate binder adherence?

• Sodium
• Magnesium
• Phosphorus (Correct answer)
• Calcium

Correct answer: Phosphorus

Phosphate binders are medications taken with meals to prevent the absorption of dietary phosphorus. If a patient does not adhere to their phosphate binder regimen, phosphorus from food will be absorbed and accumulate in the blood, leading to hyperphosphatemia. This can cause severe bone and cardiovascular complications, highlighting the importance of adherence.

Question 138: What is the minimum recommended distance between the arterial and venous needles during AV fistula cannulation to minimize recirculation?

• 5 cm (Correct answer)
• 10 cm
• 1 cm
• 2 cm

Correct answer: 5 cm

Placing needles at least 5 cm (approximately 2 inches) apart prevents recirculation, which occurs when already-dialyzed blood is immediately re-drawn into the arterial needle. Recirculation reduces treatment adequacy and Kt/V.

Question 139: When using bleach (sodium hypochlorite) as a cleaning agent in dialyzer reprocessing, what is the primary hazard to the patient if residual bleach is not adequately removed?

• Metabolic alkalosis
• Hypoglycemia
• Intravascular hemolysis (Correct answer)
• Severe hypertension

Correct answer: Intravascular hemolysis

Residual sodium hypochlorite (bleach) in the blood compartment can cause intravascular hemolysis, destroying red blood cells and leading to hemolytic anemia, hemoglobinemia, and potentially renal tubular damage in any remaining kidney function. This is a serious and potentially fatal complication.

Question 140: Because of increasing phosphorus levels, a patient has been prescribed a phosphate binder, but the patient is unsure when to take the medication. The best advice is to take the medication ____________.

• before bedtime
• after meals
• with meals (Correct answer)
• before meals

Correct answer: with meals

Phosphate binders work by binding to phosphorus in the food consumed, preventing its absorption into the bloodstream. Therefore, to be most effective, phosphate binders should be taken with meals or immediately before them. This timing ensures the medication is present in the digestive tract when phosphorus from food is being processed, maximizing its binding capacity.

Question 141: A patient develops muscle cramps during hemodialysis. What is the most appropriate initial intervention?

• Apply heat packs to the affected muscles
• Discontinue treatment immediately
• Increase blood pump speed
• Reduce ultrafiltration rate and administer a small normal saline bolus (Correct answer)

Correct answer: Reduce ultrafiltration rate and administer a small normal saline bolus

Muscle cramps during dialysis are usually caused by excessive fluid removal or low plasma osmolality; reducing the UF rate and giving a small saline bolus corrects fluid shifts.

Question 142: When inserting the arterial needle into an AV fistula for hemodialysis, in which direction should the needle bevel face and why?

• Needle direction does not affect blood flow and is based on technician preference
• Bevel up (facing away from the vessel wall) to facilitate entry into the lumen and optimal blood inflow (Correct answer)
• Bevel toward the arterial anastomosis to align with the direction of blood flow
• Bevel down (facing the vessel wall) to prevent the bevel from sucking against the vessel wall

Correct answer: Bevel up (facing away from the vessel wall) to facilitate entry into the lumen and optimal blood inflow

The needle bevel should face upward (away from the vessel wall) during insertion to facilitate smooth entry into the vessel lumen, reduce vessel wall trauma during insertion, and prevent the needle bevel from creating a flap valve against the vessel wall that would obstruct blood inflow.

Question 143: Acceptable limits for total chlorines in water for hemodialysis are?

• less than 0 .1mg/L (ppm) (Correct answer)
• 0.5 mg/L to 1 mg/L(ppm)
• greater than 6.0 mg/L(ppm)
• 3.5 mg/L to 5.5 mg/L to 5.5 mg/L(ppm)

Correct answer: less than 0 .1mg/L (ppm)

Chlorine and chloramines are highly toxic to hemodialysis patients, as they can cause hemolysis (destruction of red blood cells) if present in the dialysate. Therefore, strict standards are in place for water quality used in hemodialysis. The acceptable limit for total chlorines (chlorine and chloramines) in water for hemodialysis is extremely low, typically less than 0.1 mg/L (parts per million), to ensure patient safety.

Question 144: Which acid-base disturbance is most common in ESRD patients before dialysis treatment?

• Metabolic alkalosis
• Respiratory acidosis
• Metabolic acidosis (Correct answer)
• Respiratory alkalosis

Correct answer: Metabolic acidosis

ESRD patients develop metabolic acidosis because the kidneys can no longer excrete acid or regenerate bicarbonate, causing accumulation of organic acids.

Question 145: Which intervention is correct when a clot is detected in the extracorporeal circuit?

• Flush with heparin
• Continue treatment
• Stop blood pump and notify nurse (Correct answer)
• Switch to saline rinse

Correct answer: Stop blood pump and notify nurse

When a clot is detected in the extracorporeal circuit, the correct intervention is to stop the blood pump and notify the nurse immediately. A clot can obstruct blood flow, damage the dialyzer, or potentially lead to an air embolism if it dislodges. Stopping the pump prevents further complications and allows for prompt assessment and management by qualified personnel.

Question 146: A dialyzer arrives at the reprocessing area and is found to have a crack in the header cap. What is the correct action?

• Reprocess the dialyzer if TCV and pressure tests are within normal limits
• Quarantine the dialyzer and notify the supervisor for assessment
• Repair the crack with medical-grade adhesive before reprocessing
• Discard the dialyzer immediately without reprocessing (Correct answer)

Correct answer: Discard the dialyzer immediately without reprocessing

A cracked header cap compromises the structural integrity of the dialyzer and creates a potential pathway for contamination and blood leakage. The dialyzer must be discarded immediately—no reprocessing is appropriate for a physically damaged dialyzer.

Question 147: The required contact time for dialyzer reprocessing in a dialysis facility using peracetic acid as the germicide is ____________.

• 11 hours. (Correct answer)
• 20 hours.
• 24 hours.
• 10 hours.

Correct answer: 11 hours.

The required contact time for dialyzer reprocessing at a dialysis facility using peracetic acid as the germicide is 11 hours. There are four primary forms of germicides, but only one can be used at a time: heat disinfection (with citric acid) (20 hours contact time), glutaraldehyde (10 hours contact time), formaldehyde (24 hours contact time), and peracetic acid (most frequently used). Although peracetic acid is more expensive than the majority of other germicides, it is less dangerous for users than formaldehyde or glutaraldehyde.

Question 148: Venous pressure meters are calibrated in:

• mL/hour
• PSI
• mm/Hg (Correct answer)
• mg%

Correct answer: mm/Hg

Venous pressure meters used in hemodialysis are calibrated in millimeters of mercury (mm/Hg). This unit is the standard measurement for blood pressure and other physiological pressures. Using mm/Hg provides a consistent and accurate way to monitor the pressure in the venous line, which reflects resistance to blood returning to the patient.

Question 149: What is the primary function of a dialysis machine?

• To assist with breathing
• To monitor vital signs
• To administer medications
• To filter blood and remove waste (Correct answer)

Correct answer: To filter blood and remove waste

The primary function of a dialysis machine is to act as an artificial kidney for patients with end-stage renal disease. It filters the patient's blood to remove excess fluid, waste products (like urea, creatinine, and potassium), and toxins that their own kidneys can no longer eliminate. This process helps to maintain the body's chemical balance and prevent life-threatening complications.

Question 150: What is the function of heparin in dialysis?

• Prevent clotting (Correct answer)
• Increase dialysate flow
• Aid in filtration
• Lower blood pressure

Correct answer: Prevent clotting

Heparin is an anticoagulant administered during hemodialysis to prevent blood from clotting within the extracorporeal circuit, which includes the bloodlines and dialyzer. Without heparin, the blood would clot in the tubing, rendering the treatment ineffective and potentially causing significant blood loss. It ensures a smooth and continuous flow of blood for efficient filtration.