Certified Phlebotomy Technician Exam Certified Phlebotomy Technician (CPT) MCQ 2

Question 1

Which additive in a gray-top tube is used to inhibit glycolysis for glucose testing?

Accepted Answer

Sodium fluoride

Answer

Sodium fluoride (with potassium oxalate) in gray-top tubes inhibits glycolytic enzymes to preserve glucose levels.

Question 2

A patient reports feeling dizzy and lightheaded during a venipuncture. What is the FIRST action the phlebotomist should take?

Accepted Answer

Remove the needle and have the patient lie down

Answer

If a patient shows signs of syncope, immediately remove the needle and position the patient safely (lying down or head between knees) to restore blood flow to the brain.

Question 3

When performing a capillary puncture on an adult finger, which area should be avoided?

Accepted Answer

The very tip and center of the finger

Answer

The tip and center of the finger should be avoided because they have more nerve endings and the skin is thinner, increasing pain and risk of bone puncture.

Question 4

Which of the following BEST describes the purpose of the 'order of draw' in multi-tube venipuncture?

Accepted Answer

To prevent cross-contamination of tube additives

Answer

The order of draw is established to prevent carry-over of additives from one tube to the next, which could interfere with test results.

Question 5

A specimen for prothrombin time (PT) testing requires a light blue-top tube. What is the correct blood-to-additive ratio?

Accepted Answer

9:1

Answer

Light blue-top tubes contain sodium citrate and require a 9:1 blood-to-anticoagulant ratio to ensure accurate coagulation results.

Certified Phlebotomy Technician Exam Practice Test

Certified Phlebotomy Technician Exam Practice Test

Certified Phlebotomy Technician Exam Certified Phlebotomy Technician (CPT) MCQ 2