ASCP - Phlebotomy Technician Order of Draw and Additives Questions and Answers

Question 1

A phlebotomist needs to collect a CBC, a PT, and a glucose test. Which of the following represents the correct order of draw?

Accepted Answer

Light blue, lavender, gray

Answer

Lavender, gray, light blue

Answer

Gray, light blue, lavender

Answer

Light blue, gray, lavender

Question 2

Which additive is present in a lavender top tube and what is its primary function?

Accepted Answer

EDTA; to prevent clotting by binding calcium

Answer

Sodium Citrate; to perform coagulation studies

Answer

Silica; to activate clotting

Answer

Sodium Fluoride; to inhibit glycolysis

Question 3

A phlebotomist is tasked with drawing blood for a STAT chemistry panel. Which color tube, containing which additive, would be most appropriate?

Accepted Answer

Green top; Heparin

Answer

Light blue top; Sodium Citrate

Answer

Gray top; Potassium Oxalate

Answer

Red top; No additive

Question 4

During a multi-tube draw, a phlebotomist draws a lavender top tube before a light blue top tube. What is the most likely consequence of this error?

Accepted Answer

The clotting time in the light blue tube may be falsely prolonged.

Answer

The glucose level in the light blue tube will be falsely elevated.

Answer

The potassium level in the light blue tube will be falsely decreased.

Answer

The red blood cell count in the lavender tube will be inaccurate.

Question 5

Which of the following tubes contains an additive that acts as a glycolytic inhibitor?

Accepted Answer

Gray top tube

Answer

Serum Separator Tube (SST)

Answer

Lavender top tube

Answer

Green top tube

Question 6

A physician orders blood cultures, a coagulation test, and a complete blood count. To prevent cross-contamination, what is the first tube the phlebotomist should draw?

Accepted Answer

Blood culture bottles

Answer

Light blue top tube

Answer

Lavender top tube

Answer

Red top tube