Certified Phlebotomy Technician Exam Phlebotomy Fundamentals 3

Question 1

What is the primary purpose of inverting tubes after collection?

Accepted Answer

To mix the anticoagulant or additive with blood

Answer

Gentle inversion ensures the additive is thoroughly mixed with the blood to prevent clotting or inadequate preservation.

Question 2

Which vein is considered the FIRST choice for routine venipuncture?

Accepted Answer

Median cubital vein

Answer

The median cubital vein is largest, most stable, and least painful, making it the preferred site for routine draws.

Question 3

A gray-top tube contains sodium fluoride. What is its primary purpose?

Accepted Answer

To inhibit glycolysis and preserve glucose levels

Answer

Sodium fluoride inhibits the enzymes responsible for glycolysis, preserving glucose concentration in the specimen.

Question 4

How long should a tourniquet be left on before venipuncture is performed?

Accepted Answer

No more than 1 minute

Answer

Leaving a tourniquet on longer than 1 minute causes hemoconcentration and alters test results.

Question 5

What condition requires a phlebotomist to avoid the ipsilateral arm for venipuncture?

Accepted Answer

Presence of a mastectomy on that side

Answer

After a mastectomy, lymph node removal compromises drainage on that side, increasing infection and lymphedema risk with any puncture.

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