What is the most important step in ensuring accurate patient identification before venipuncture?
Verifying the patient's full name and date of birth ensures correct identification and reduces the risk of specimen labeling errors.
Which vein is most commonly used for routine venipuncture?
The median cubital vein is preferred because it is large, close to the surface, and has fewer nerves and arteries nearby.
What is the correct order of draw when using evacuated tube collection?
Following the proper order of draw prevents cross-contamination of additives, ensuring valid lab results.
Which additive is found in the lavender-top tube and what is its function?
EDTA is used in lavender-top tubes to preserve the shape of cells and prevent clotting by chelating calcium.
What should a phlebotomy technician do if a patient begins to feel faint during a blood draw?
Removing the tourniquet and assisting the patient to a safe position helps prevent injury from fainting during venipuncture.
Which of the following actions may lead to hemolysis of the blood sample?
Small gauge needles can cause red blood cells to rupture due to high pressure during collection, leading to hemolysis.
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Why should blood cultures be drawn first when performing multiple tests?
Drawing blood cultures first prevents contamination from additives in other tubes, which could compromise test results.
Which of the following is considered a critical step in preventing needlestick injuries?
Immediate disposal of needles into a sharps container helps prevent accidental needlestick injuries and ensures safe handling.
What is the primary purpose of the tourniquet during venipuncture?
A tourniquet temporarily slows venous blood flow, making the veins more visible and easier to access.
How long should pressure be applied to a venipuncture site after removing the needle?
Pressure must be applied until bleeding ceases to prevent bruising or hematoma formation at the puncture site.
Which of the following is the correct procedure for labeling specimens?
Proper labeling at the point of collection reduces errors and ensures the specimen is accurately matched to the patient.