Certified Phlebotomy Technician Exam General 2

Question 1

Which additive in a light blue (sodium citrate) tube prevents clotting by binding calcium?

Accepted Answer

Sodium citrate

Answer

Sodium citrate chelates calcium ions, which are necessary for the clotting cascade, thereby preventing coagulation.

Question 2

What is the maximum recommended angle for needle insertion during a routine venipuncture?

Accepted Answer

30 degrees

Answer

A 15–30 degree angle is recommended for venipuncture; 30 degrees is the maximum to avoid passing through the vein.

Question 3

A patient's arm shows a large bruise at a recent draw site. This condition is called:

Accepted Answer

Hematoma

Answer

A hematoma is a localized collection of blood outside blood vessels caused by leakage during or after venipuncture.

Question 4

Which tube should be collected FIRST when drawing only a coagulation specimen?

Accepted Answer

A discard tube

Answer

A discard tube is drawn first to clear the needle of tissue factor and air that could activate coagulation before filling the citrate tube.

Question 5

Which vein is considered the FIRST choice for routine adult venipuncture?

Accepted Answer

Median cubital vein

Answer

The median cubital vein is preferred because it is large, well-anchored, and least likely to roll or bruise.

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