#1
Which of the following is a common site for venipuncture?
Cephalic vein
ExplanationCommonly used due to accessibility and size.
#2
What is the purpose of using a tourniquet during phlebotomy?
To aid in locating veins
ExplanationIncreases venous distension for easier vein location.
#3
Which anticoagulant is commonly used in blood collection tubes for routine chemistry tests?
Heparin
ExplanationPrevents blood clotting by inhibiting thrombin formation.
#4
What does the term 'Hemoconcentration' refer to in phlebotomy?
Increased red blood cell count
ExplanationConcentration of blood due to decreased plasma volume.
#5
Which of the following is a potential complication of venipuncture?
Hematoma
ExplanationLocalized bleeding under the skin due to vessel puncture.
#6
What is the function of the additive 'EDTA' in blood collection tubes?
Binds calcium ions to prevent coagulation
ExplanationChelates calcium ions, halting coagulation cascade.
#7
What is the purpose of performing a 'capillary puncture'?
To obtain small blood samples, especially in children
ExplanationMinimally invasive method suitable for small volumes.
#8
What is the purpose of 'palpating' the vein before venipuncture?
To assess vein size, depth, and resilience
ExplanationEnsures successful needle insertion and reduces discomfort.
#9
What is the purpose of 'anchoring' the vein during venipuncture?
To keep the vein from rolling or moving during needle insertion
ExplanationEnsures stable needle placement and minimizes discomfort.