NCCT National Certified Phlebotomy Technician MCQ 3

Question 1

A complete blood count (CBC) specimen must be collected in which tube?

Accepted Answer

Lavender/purple (EDTA)

Answer

Red-top (no additive)

Answer

Light blue (sodium citrate)

Answer

Green (lithium heparin)

Question 2

Which of the following is an example of a timed specimen that must be drawn at a specific time?

Accepted Answer

Peak drug level (e.g., vancomycin)

Answer

Random urine specimen

Answer

Type and screen

Answer

Routine cholesterol panel

Question 3

What is the purpose of the buffy coat layer visible after blood centrifugation?

Accepted Answer

It is a thin layer of white blood cells and platelets between plasma and red blood cells

Answer

It contains serum proteins for chemistry testing

Answer

It is formed by clotting factors during centrifugation

Answer

It contains only fibrinogen

Question 4

Which anticoagulant prevents clotting by inhibiting thrombin through activation of antithrombin III?

Accepted Answer

Heparin

Answer

EDTA

Answer

Sodium citrate

Answer

Potassium oxalate

Question 5

A specimen for erythrocyte sedimentation rate (ESR) should be collected in which tube?

Accepted Answer

Lavender (EDTA) or black (sodium citrate for ESR)

Answer

Red-top (no additive)

Answer

Green (lithium heparin)

Answer

Gray (sodium fluoride)

Question 6

Which laboratory department performs blood typing, crossmatching, and antibody screening?

Accepted Answer

Blood bank (immunohematology/transfusion services)

Answer

Clinical chemistry

Answer

Hematology

Answer

Microbiology