NCCT Equipment, Tubes, and Additives 2

Question 1

What is the function of sodium fluoride in a gray-top tube?

Accepted Answer

Inhibits glycolysis to preserve glucose levels

Answer

Prevents platelet aggregation

Answer

Activates clotting factors

Answer

Chelates calcium ions

Question 2

Which tube color contains the anticoagulant EDTA?

Accepted Answer

Lavender/purple

Answer

Light blue

Answer

Green

Answer

Red

Question 3

What is the purpose of a butterfly (winged infusion) needle set?

Accepted Answer

To access small or difficult veins with greater control

Answer

To collect large volumes of blood quickly

Answer

To prevent needle stick injuries only

Answer

To draw arterial blood samples

Question 4

What does the thixotropic gel in a serum separator tube (SST) do during centrifugation?

Accepted Answer

Forms a barrier between serum and the cell clot

Answer

Activates clotting to speed up coagulation

Answer

Dissolves fibrin to prevent clotting

Answer

Binds to proteins for analysis

Question 5

When using a syringe for blood collection, what is the correct method for transferring blood to evacuated tubes?

Accepted Answer

Attach a transfer device and allow the vacuum to pull blood in

Answer

Push the plunger forcefully to fill tubes quickly

Answer

Remove the needle and pour blood into each tube

Answer

Squirt blood through the needle directly into tubes

Question 6

What gauge needle is most commonly used for routine adult venipuncture?

Accepted Answer

21-gauge

Answer

18-gauge

Answer

25-gauge

Answer

27-gauge