Free CCHT Interpretation of Common Laboratory Values Questions and Answers 1 — Questions and Answers
Question 1: A high pre-dialysis Blood Urea Nitrogen (BUN) level most likely indicates:
- The patient is well-hydrated.
- The patient has been non-compliant with their fluid restriction.
- The patient has inadequate protein intake.
- Inadequate dialysis or excessive protein intake. (Correct answer)
Correct answer: Inadequate dialysis or excessive protein intake.
BUN is a waste product of protein metabolism. A high pre-dialysis level can indicate that the previous dialysis treatment was not adequate to clear the waste products, or the patient is consuming more protein than recommended.
Question 2: A hemodialysis patient's lab results show a low hemoglobin and hematocrit. This is most commonly associated with:
- Anemia of chronic kidney disease. (Correct answer)
- Hyperkalemia.
- Dehydration.
- High phosphorus levels.
Correct answer: Anemia of chronic kidney disease.
Diseased kidneys produce less erythropoietin (EPO), a hormone that stimulates the bone marrow to produce red blood cells. This leads to anemia, which is characterized by low hemoglobin and hematocrit levels.
Question 3: A patient's pre-dialysis potassium level is 6.8 mEq/L. This finding is considered:
- Within the normal range.
- Low and requires potassium supplementation.
- Critically high and requires immediate attention. (Correct answer)
- Slightly elevated but not concerning.
Correct answer: Critically high and requires immediate attention.
A normal serum potassium level is typically 3.5-5.0 mEq/L. A level of 6.8 mEq/L is considered critically high (hyperkalemia) and can lead to life-threatening cardiac arrhythmias, requiring immediate intervention.
Question 4: In chronic kidney disease, what is the typical relationship between serum calcium and serum phosphorus levels before treatment?
- Both are typically high.
- Both are typically low.
- 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 5: The Urea Reduction Ratio (URR) is a primary method used to measure:
- The patient's nutritional status.
- The adequacy of a hemodialysis treatment. (Correct answer)
- The patient's interdialytic weight gain.
- The level of fluid overload.
Correct answer: The adequacy of a hemodialysis treatment.
URR calculates the percentage of urea removed during a single dialysis session by comparing pre- and post-dialysis BUN levels. A URR of 65% or greater is the minimum acceptable standard, indicating adequate treatment.
Question 6: Serum creatinine is a waste product that is primarily used as a marker for:
- Liver function.
- Muscle breakdown and kidney function. (Correct answer)
- Blood glucose control.
- Hydration status.
Correct answer: Muscle breakdown and kidney function.
Creatinine is a waste product generated from normal muscle metabolism. Healthy kidneys filter creatinine from the blood, so when kidney function declines, serum creatinine levels rise, making it a reliable indicator.
Question 7: In the context of dialysis adequacy, what does Kt/V represent?
- Potassium (K) and total (t) volume (V).
- A measure of the patient's blood pressure and volume status.
- A calculation involving clearance, time, and volume to measure dose of dialysis. (Correct answer)
- The rate of ultrafiltration during treatment.
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.
Free CCHT Interpretation of Common Laboratory Values Questions and Answers 1
A high pre-dialysis Blood Urea Nitrogen (BUN) level most likely indicates: