Certified Phlebotomy Technician Exam Equipment and Supplies

Question 1

Which needle gauge is most commonly used for routine venipuncture in adults?

Accepted Answer

21 gauge

Answer

A 21-gauge needle is the standard choice for routine adult venipuncture, balancing flow rate and vein trauma.

Question 2

What is the primary purpose of the evacuated tube system (ETS) in phlebotomy?

Accepted Answer

To create a vacuum that draws blood directly into the tube

Answer

The evacuated tube system uses a pre-measured vacuum to draw a precise volume of blood directly into the collection tube.

Question 3

Which additive is found in a light blue (sodium citrate) tube?

Accepted Answer

Sodium citrate

Answer

Light blue-topped tubes contain sodium citrate, which is used for coagulation studies by chelating calcium ions.

Question 4

What is the correct blood-to-additive ratio required for a sodium citrate (light blue) tube?

Accepted Answer

9:1

Answer

Light blue tubes require a 9:1 blood-to-sodium-citrate ratio; underfilling invalidates coagulation test results.

Question 5

A butterfly needle is most appropriate for which situation?

Accepted Answer

Small or fragile veins and pediatric patients

Answer

Butterfly (winged infusion) needles are designed for small, fragile, or difficult veins, including those in children and elderly patients.

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