NCCT Equipment, Tubes, and Additives 3

Question 1

In the correct order of draw for evacuated tubes, which tube is collected first?

Accepted Answer

Blood culture bottles

Answer

Lavender (EDTA)

Answer

Light blue (sodium citrate)

Answer

Green (heparin)

Question 2

What additive is found in green-top evacuated tubes?

Accepted Answer

Heparin (lithium or sodium)

Answer

Sodium citrate

Answer

EDTA

Answer

Potassium oxalate

Question 3

Why must a light blue-top tube be completely filled to the indicated mark?

Accepted Answer

To maintain the correct 9:1 blood-to-anticoagulant ratio

Answer

To prevent hemolysis of red blood cells

Answer

To ensure sufficient sample for repeat testing

Answer

To prevent the tube from cracking during centrifugation

Question 4

What is the purpose of clot activator in a red/gold-top tube?

Accepted Answer

To accelerate clot formation for faster serum separation

Answer

To prevent the blood from clotting

Answer

To preserve glucose levels

Answer

To bind calcium for coagulation testing

Question 5

A phlebotomist needs to collect a specimen for trace metal analysis. Which tube should be used?

Accepted Answer

Royal blue-top tube with EDTA

Answer

Standard lavender-top EDTA tube

Answer

Green-top lithium heparin tube

Answer

Red-top glass tube

Question 6

How many times should an evacuated tube with anticoagulant be inverted after collection?

Accepted Answer

8-10 times

Answer

3-4 times

Answer

15-20 times

Answer

No mixing is required