CLS CLS Hematology and Coagulation

Question 1

Which blood cell type is primarily responsible for oxygen transport?

Accepted Answer

Erythrocytes

Answer

Erythrocytes contain hemoglobin, which binds and carries oxygen to tissues throughout the body.

Question 2

What is the normal reference range for hemoglobin in adult males?

Accepted Answer

13.5–17.5 g/dL

Answer

The normal hemoglobin range for adult males is 13.5–17.5 g/dL, higher than the female reference range.

Question 3

Which coagulation pathway is initiated by tissue factor (Factor III)?

Accepted Answer

Extrinsic pathway

Answer

The extrinsic pathway is activated by tissue factor released from damaged tissue, which complexes with Factor VII.

Question 4

The Prothrombin Time (PT) test primarily evaluates which coagulation pathway(s)?

Accepted Answer

Extrinsic and common pathways

Answer

PT evaluates the extrinsic and common pathways by measuring activity of Factors II, V, VII, X, and fibrinogen.

Question 5

Which white blood cell type is normally most numerous on a peripheral blood smear?

Accepted Answer

Neutrophils

Answer

Neutrophils typically comprise 50–70% of the total white blood cell count in healthy adults.

CLS - Certified Laboratory Professional Practice Test