#1
Which of the following veins is commonly used for venipuncture?
Cephalic vein
ExplanationCommonly accessible and suitable for blood collection.
#2
What is the purpose of using a tourniquet during venipuncture?
To restrict blood flow
ExplanationFacilitates vein engorgement for easier needle insertion.
#3
What is the purpose of palpating a vein before venipuncture?
To assess vein size and depth
ExplanationDetermines suitable vein for successful venipuncture.
#4
Which vein is often used for venipuncture when other options are limited, especially in pediatric patients?
Dorsal venous arch
ExplanationAccessible and less painful option for pediatric venipuncture.
#5
What is the primary reason for discarding the first few milliliters of blood during venipuncture?
To avoid contamination by skin cells
ExplanationMinimizes contamination from skin flora and cells.
#6
What is the recommended site for capillary puncture in adults?
Lateral aspect of the fingertip
ExplanationAccessible and less painful site for capillary puncture in adults.
#7
Which of the following anticoagulants is commonly used in blood collection tubes?
Heparin
ExplanationPrevents blood clotting to maintain sample integrity.
#8
What is the primary reason for using a butterfly needle during phlebotomy?
To access difficult veins
ExplanationFacilitates access to small or challenging veins.
#9
Which of the following is a potential complication of improper tourniquet application?
Hemolysis
ExplanationLeads to increased fragility and rupture of red blood cells.
#10
What is the primary purpose of a butterfly needle in phlebotomy?
To minimize pain during venipuncture
ExplanationLess traumatic and painful for patients during blood collection.
#11
What is the primary purpose of the order of draw in phlebotomy?
To prevent sample contamination
ExplanationMinimizes carryover of additives or substances between samples.
#12
Which factor contributes to the formation of a hematoma during venipuncture?
Inadequate pressure on the puncture site
ExplanationCauses leakage of blood into surrounding tissue, forming a hematoma.
#13
Which of the following factors can lead to hemolysis during blood collection?
Applying excessive force to the syringe plunger
ExplanationCauses rupture of red blood cells, leading to hemolysis.
#14
Which color tube is typically used for coagulation studies?
Blue
ExplanationContains sodium citrate to prevent blood clotting for coagulation tests.
#15
What is the correct order of draw for capillary blood collection?
Microtainer, Lavender, Green
ExplanationPrevents cross-contamination and ensures accurate results.
#16
What is the purpose of the additive EDTA in blood collection tubes?
Prevent clotting
ExplanationChelates calcium ions to inhibit coagulation cascade.
#17
Which technique is commonly used for capillary puncture in infants?
Lancet puncture on the fingertip
ExplanationAccessible and less painful for capillary blood collection in infants.
#18
In phlebotomy, what does the term 'venous stasis' refer to?
The pooling of blood in veins
ExplanationTemporary cessation of blood flow within veins.