Phlebotomy Test American Society for Clinical Pathology 3

Question 1

Which vein is most commonly selected for routine venipuncture according to ASCP phlebotomy guidelines?

Accepted Answer

Median cubital vein

Answer

The median cubital vein is the preferred first choice for venipuncture because it is large, well-anchored, and typically less painful.

Question 2

When using the evacuated tube system, what is the correct action if blood stops flowing before the tube is full?

Accepted Answer

Gently rotate the tube and slightly advance or retract the needle

Answer

Gently adjusting needle position and rotating the tube can restore blood flow without restarting the draw.

Question 3

According to ASCP standards, the maximum time a tourniquet should remain applied before venipuncture is performed is:

Accepted Answer

1 minute

Answer

Tourniquet application should not exceed 1 minute to prevent hemoconcentration and erroneous lab results.

Question 4

A patient is on warfarin therapy. Which post-venipuncture action requires special attention?

Accepted Answer

Holding pressure longer to prevent hematoma formation

Answer

Anticoagulant therapy impairs clotting, so extended pressure application is critical to prevent hematoma.

Question 5

Which ASCP-recommended needle gauge is standard for routine adult venipuncture?

Accepted Answer

21 gauge

Answer

21-gauge needles are the standard for routine adult venipuncture, balancing flow rate and patient comfort.

Phlebotomy Practice Test