#1
Which of the following is the most appropriate site for venipuncture?
Antecubital fossa
ExplanationOptimal location due to accessibility and minimal risk.
#2
What is the primary reason for inverting anticoagulant tubes after collection?
To mix the blood with the anticoagulant
ExplanationEnsures proper mixing to prevent clot formation.
#3
What is the primary purpose of the tourniquet in phlebotomy?
To make the vein more visible and palpable
ExplanationImproves vein visibility and facilitates venipuncture.
#4
What is the recommended angle of needle insertion for a venipuncture?
15 to 30 degrees
ExplanationOptimal angle for successful vein access and minimal discomfort.
#5
How long should a tourniquet be applied during venipuncture?
Less than 1 minute
ExplanationMinimizes the risk of hemoconcentration without causing patient discomfort.
#6
What is the correct order of draw in phlebotomy?
Blood culture bottle or tube, coagulation tube, serum tube
ExplanationSequencing to avoid cross-contamination with additives.
#7
Which of the following needles has the largest diameter?
18 gauge
ExplanationLarger gauge indicates a wider needle diameter.
#8
Which anticoagulant is commonly used in tubes for hematology tests?
EDTA
ExplanationEDTA prevents blood clotting, suitable for hematological analysis.
#9
What is the most appropriate action if a phlebotomist experiences a needlestick injury?
Immediately wash the area with soap and water
ExplanationPrompt cleansing reduces infection risk.
#10
Which tube is typically used for glucose testing?
Gray top
ExplanationGray top tubes contain an anticoagulant suitable for glucose analysis.
#11
Which of the following is a critical safety measure to prevent needlestick injuries after venipuncture?
Using a needle disposal container
ExplanationProper disposal reduces the risk of accidental injuries.
#12
For which of the following conditions is it necessary to apply special precautions during phlebotomy?
Bleeding disorders
ExplanationExtra care needed due to potential bleeding complications.
#13
What is the significance of the 'order of draw' in phlebotomy?
It prevents contamination of samples with additives from other tubes
ExplanationEnsures sample purity by avoiding cross-tube contamination.
#14
What is the risk of not properly mixing anticoagulant tubes after blood collection?
Microclot formation
ExplanationIncomplete mixing can lead to small clots affecting test results.
#15
What is the consequence of applying a tourniquet too tightly or for too long?
Hemoconcentration and potential alteration of test results
ExplanationCan lead to concentrated blood components, affecting test accuracy.