Certified Phlebotomy Technician Exam General 4

Question 1

A gray-top tube contains sodium fluoride. Its PRIMARY purpose is to:

Accepted Answer

Preserve glucose by inhibiting glycolysis

Answer

Sodium fluoride inhibits the enzyme enolase, halting glycolysis and stabilizing glucose levels in the specimen.

Question 2

Which standard precaution applies to ALL patients regardless of known infection status?

Accepted Answer

Treating all blood and body fluids as potentially infectious

Answer

Standard precautions require treating every patient's blood and body fluids as infectious to protect both patient and healthcare worker.

Question 3

A 2:1 blood-to-additive ratio error in a sodium citrate tube most commonly causes:

Accepted Answer

Falsely prolonged PT/aPTT results

Answer

Underfilling a citrate tube leaves excess anticoagulant, which falsely prolongs clotting times by over-chelating calcium.

Question 4

The antecubital fossa is located:

Accepted Answer

In the inner bend of the elbow

Answer

The antecubital fossa is the triangular depression at the front of the elbow, where the major veins used for venipuncture are found.

Question 5

Which organization publishes the H3 and H4 guidelines used for phlebotomy procedures?

Accepted Answer

CLSI

Answer

The Clinical and Laboratory Standards Institute (CLSI) publishes procedure standards including H3 for venipuncture and H4 for skin puncture.

Certified Phlebotomy Technician Exam Practice Test