Medical Technologist Test Hematology

Question 1

Which white blood cell type is the first to respond to a bacterial infection?

Accepted Answer

Neutrophil

Answer

Neutrophils are the primary phagocytic cells that migrate to sites of bacterial infection within hours.

Question 2

What is the normal mean corpuscular volume (MCV) range in adults?

Accepted Answer

80–100 fL

Answer

Normal MCV is 80–100 fL; values outside this range indicate microcytic or macrocytic anemia.

Question 3

A peripheral blood smear showing target cells is MOST associated with which condition?

Accepted Answer

Hemoglobin C disease

Answer

Target cells (codocytes) are classically associated with hemoglobin C disease, liver disease, and thalassemia.

Question 4

Which laboratory finding is characteristic of disseminated intravascular coagulation (DIC)?

Accepted Answer

Prolonged PT and aPTT with low platelets

Answer

DIC is characterized by prolonged PT, prolonged aPTT, thrombocytopenia, elevated D-dimer, and decreased fibrinogen.

Question 5

Hypersegmented neutrophils on a peripheral smear are a hallmark of which deficiency?

Accepted Answer

Folate or vitamin B12 deficiency

Answer

Hypersegmented neutrophils (>5 lobes) indicate megaloblastic anemia caused by folate or vitamin B12 deficiency.

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