Certified Phlebotomy Technician Exam Trivia 4

Question 1

What is the purpose of inverting a blood collection tube after draw?

Accepted Answer

To mix the blood with the additive

Answer

Inverting the tube mixes the blood with the additive (anticoagulant or clot activator) to ensure proper specimen integrity.

Question 2

Which artery is most commonly used for arterial blood gas (ABG) collection?

Accepted Answer

Radial artery

Answer

The radial artery at the wrist is preferred for ABG collection because it is accessible, has good collateral circulation, and is easy to compress after the draw.

Question 3

What does a positive Allen test result indicate before radial artery puncture?

Accepted Answer

Adequate collateral circulation exists from the ulnar artery

Answer

A positive Allen test confirms adequate ulnar artery collateral flow, meaning the hand will remain perfused even if the radial artery is damaged.

Question 4

Which tube is used to collect a specimen for a fasting blood glucose test?

Accepted Answer

Gray top (sodium fluoride)

Answer

The gray top tube contains sodium fluoride, a glycolytic inhibitor that prevents red blood cells from consuming glucose and preserves the sample accurately.

Question 5

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

Accepted Answer

15–30 degrees

Answer

A 15–30 degree angle optimizes vein entry while minimizing the risk of passing through the vein or causing excessive trauma.

Certified Phlebotomy Technician Exam Practice Test

Certified Phlebotomy Technician Exam Practice Test

Certified Phlebotomy Technician Exam Trivia 4