FREEE ASCP Orders and Equipment Selection 1 — Questions and Answers

Question 1: In what situation is a butterfly needle a better option than a vacutainer system?

the patient has small or fragile veins (Correct answer)
the patient requires several draws
the patient is donating blood
the patient is unconscious

Correct answer: the patient has small or fragile veins

A butterfly needle has a smaller gauge needle and flexible tubing, which reduces trauma to delicate veins. This design makes it ideal for venipuncture in patients with small, fragile, or difficult-to-access veins, such as pediatric or geriatric patients, or those undergoing chemotherapy. Its precise control helps prevent vein collapse and improves patient comfort.

Question 2: Which anticoagulant is used in a tube that has a gray stopper?

fluoride and thymol
citrate and thymol
sodium fluoride and thymol (Correct answer)
sodium citrate and thymol

Correct answer: sodium fluoride and thymol

Tubes with a gray stopper are primarily used for glucose testing. Sodium fluoride acts as an antiglycolytic agent, preventing glucose metabolism by red blood cells, thus preserving the glucose concentration in the sample. Thymol is also an antiglycolytic agent, further enhancing the preservation of glucose for accurate measurement.

Question 3: Which glass tube among the following is additive-free?

a tube with a dark green top
a tube with a red top (Correct answer)
a tube with an orange top
a tube with a royal blue top

Correct answer: a tube with a red top

Red-top tubes are typically plain glass tubes that contain no additives, anticoagulants, or gels. They are used to collect serum for various chemistry tests, serology, and blood banking procedures where clotting is desired and no interference from additives is needed. The blood clots naturally, and the serum is then separated.

Question 4: Which of the following is regarded as appropriate approach when cleaning a site before venipuncture?

wipe the venipuncture site in the direction of blood flow
clean internally in circular motions, completing the procedure at the planned venipuncture site.
start at the planned venipuncture site and work your way outward in circular motions. (Correct answer)
Cleanse the venipuncture site in the opposite direction of the blood flow.

Correct answer: start at the planned venipuncture site and work your way outward in circular motions.

This cleaning technique ensures that microorganisms are moved away from the intended puncture site, minimizing the risk of contamination and infection. Starting at the center and moving outwards prevents reintroducing bacteria from the surrounding skin back into the clean area. This aseptic technique is critical for patient safety during venipuncture.

Question 5: What kind of anticoagulant is contained in a tube with a light-blue stopper?

thymol
heparin
sodium citrate (Correct answer)
fluoride

Correct answer: sodium citrate

Light-blue stopper tubes contain sodium citrate, which acts as an anticoagulant by binding to calcium ions, essential for the clotting cascade. These tubes are specifically used for coagulation studies, such as Prothrombin Time (PT) and Activated Partial Thromboplastin Time (APTT), because the sodium citrate preserves the clotting factors accurately. The specific concentration of sodium citrate is crucial for these tests.

Question 6: Preanalytical mistakes may happen:

with a sample before doing laboratory tests (Correct answer)
when examining a sample in a laboratory
when adjusting apparatus
When recording the identification of a patient

Correct answer: with a sample before doing laboratory tests

Preanalytical errors occur during the stages *before* the sample is actually tested in the laboratory. This includes patient preparation, sample collection, labeling, transport, and processing. These errors are the most common type of laboratory error and can significantly impact the accuracy and reliability of test results.

Question 7: In order to do a STAT glucose test, you are drawing blood. Which tube from the list below is the best option?

a tube with a red stopper
an STAT tube
a tube with a gray stopper (Correct answer)
an SST tube

Correct answer: a tube with a gray stopper

Gray-stopper tubes contain sodium fluoride and potassium oxalate (or sometimes just sodium fluoride and thymol). Sodium fluoride is an antiglycolytic agent that prevents glucose breakdown by blood cells, ensuring accurate glucose levels, especially for STAT (immediate) tests where rapid processing might not be possible. This makes it the best choice for preserving glucose for urgent analysis.

Question 8: Which of the following examinations could be combined to evaluate anomalies in clotting?

PT and PTT (Correct answer)
PT and APPT
PPT and APPT
ACT and PPT

Correct answer: PT and PTT

Prothrombin Time (PT) and Partial Thromboplastin Time (PTT, often referred to as aPTT or Activated Partial Thromboplastin Time) are the two primary screening tests used to evaluate the extrinsic and intrinsic pathways of the coagulation cascade, respectively. Performing both tests together provides a comprehensive assessment of a patient's clotting ability and helps identify specific clotting factor deficiencies or excesses.

Question 9: By what test would you keep an eye on the levels of heparin?

ACT (Correct answer)
SST
D&C
POCT

Correct answer: ACT

The Activated Clotting Time (ACT) test is a point-of-care test specifically used to monitor high-dose heparin therapy, particularly during procedures like cardiac surgery or dialysis. It measures the time it takes for whole blood to clot, providing a rapid assessment of the anticoagulant effect of heparin. This allows for immediate adjustments to heparin dosage.

Question 10: GTT is an acronym for:

glucose tricyclene test
glucose tube tolerance
glucose test tube
glucose tolerance test (Correct answer)

Correct answer: glucose tolerance test

GTT stands for Glucose Tolerance Test. This diagnostic test measures the body's ability to metabolize glucose and is used to screen for or diagnose diabetes mellitus and gestational diabetes. It involves measuring blood glucose levels at specific intervals after a patient consumes a standardized glucose solution.

Question 11: What is possible with a multidraw needle?

the drawing of blood from several venipunctures into a single tube
the extraction of blood from several venipunctures into separate tubes
the process of drawing blood from a single venipuncture using several tubes (Correct answer)
the gathering of several blood tubes from several patients

Correct answer: the process of drawing blood from a single venipuncture using several tubes

A multidraw needle, typically part of a vacutainer system, has a safety valve that allows multiple evacuated tubes to be attached and filled sequentially from a single venipuncture. This design prevents blood leakage when changing tubes and minimizes patient discomfort by avoiding multiple needle sticks. It is standard practice for collecting various blood samples during one draw.

FREEE ASCP Orders and Equipment Selection 1

In what situation is a butterfly needle a better option than a vacutainer system?