CMT Laboratory Procedures and Specimen Collection

Question 1

Which evacuated tube color is used for coagulation studies such as PT and PTT?

Accepted Answer

Light blue

Answer

Red

Answer

Lavender

Answer

Green

Question 2

According to the CLSI order of draw, which tube should be collected FIRST when multiple tubes are needed?

Accepted Answer

Blood culture bottles

Answer

EDTA (lavender) tube

Answer

SST (gold) tube

Answer

Sodium citrate (light blue) tube

Question 3

A tourniquet should be applied no longer than how many minutes before venipuncture to prevent hemoconcentration?

Accepted Answer

1 minute

Answer

30 seconds

Answer

2 minutes

Answer

5 minutes

Question 4

Which of the following actions is the MOST common cause of hemolysis during venipuncture?

Accepted Answer

Mixing tubes too vigorously

Answer

Using a large-bore needle

Answer

Collecting from an antecubital vein

Answer

Applying the tourniquet correctly

Question 5

A capillary puncture on an adult finger should be performed on which part of the fingertip?

Accepted Answer

Side of the middle or ring finger

Answer

Center of the fingertip pad

Answer

Tip of the index finger

Answer

Base of the thumb

Question 6

Which tube additive prevents glycolysis and preserves glucose levels in a specimen?

Accepted Answer

Sodium fluoride/potassium oxalate

Answer

EDTA

Answer

Sodium heparin

Answer

Sodium citrate

Question 7

When collecting a blood culture, the venipuncture site should be cleaned with:

Accepted Answer

Chlorhexidine gluconate or iodine tincture after an initial alcohol scrub

Answer

70% isopropyl alcohol only

Answer

Soap and water followed by alcohol

Answer

Povidone-iodine only