Laboratory Science Hematology and Blood Analysis

Question 1

What is the normal reference range for red blood cell (RBC) count in adult males?

Accepted Answer

4.5–5.9 × 10⁶/µL

Answer

2.5–3.5 × 10⁶/µL

Answer

7.0–9.0 × 10⁶/µL

Answer

10–12 × 10⁶/µL

Question 2

Which anticoagulant is used in the lavender (purple) top tube for CBC testing?

Accepted Answer

EDTA (ethylenediaminetetraacetic acid)

Answer

Sodium citrate

Answer

Heparin

Answer

Sodium fluoride

Question 3

What does MCV measure in a complete blood count?

Accepted Answer

Mean Corpuscular Volume — average size of red blood cells

Answer

Maximum Cell Velocity — RBC flow rate

Answer

Minimal Clotting Value — coagulation threshold

Answer

Mean Cellular Viscosity — blood thickness

Question 4

A patient with a hemoglobin of 7.5 g/dL would be classified as having which condition?

Accepted Answer

Anemia

Answer

Polycythemia

Answer

Leukocytosis

Answer

Thrombocytopenia

Question 5

Which stain is routinely used to differentiate white blood cell types on a peripheral blood smear?

Accepted Answer

Wright-Giemsa stain

Answer

Gram stain

Answer

Ziehl-Neelsen stain

Answer

India ink stain

Question 6

What is the function of platelets (thrombocytes) in hemostasis?

Accepted Answer

Form the primary platelet plug at sites of vascular injury

Answer

Carry oxygen to tissues

Answer

Fight bacterial infections

Answer

Produce coagulation factors