CLT CLT Hematology & Blood Analysis 2

Question 1

Which anticoagulant is used in the lavender-top (purple) Vacutainer tube for CBC collection?

Accepted Answer

EDTA

Answer

EDTA (ethylenediaminetetraacetic acid) is the anticoagulant in lavender-top tubes; it chelates calcium to prevent clotting without altering cell morphology.

Question 2

On a peripheral blood smear, target cells (codocytes) are most associated with which condition?

Accepted Answer

Iron deficiency anemia or liver disease

Answer

Target cells, which have a bull's-eye appearance, are classically seen in iron deficiency anemia, thalassemia, and liver disease.

Question 3

What does an increased reticulocyte count indicate about bone marrow activity?

Accepted Answer

Increased red cell production

Answer

Reticulocytes are immature red blood cells; an elevated count indicates that the bone marrow is actively producing red cells, often in response to blood loss or hemolysis.

Question 4

Which white blood cell is the most abundant in a normal adult differential count?

Accepted Answer

Neutrophils

Answer

Neutrophils make up approximately 50–70% of circulating white blood cells and are the first responders to bacterial infection.

Question 5

A hematocrit of 55% in an adult male most likely suggests which condition?

Accepted Answer

Polycythemia

Answer

A hematocrit above 52% in males indicates polycythemia, an abnormally high proportion of red blood cells in the blood.

(CLT) Clinical Laboratory Technologist Certification Practice Test

(CLT) Clinical Laboratory Technologist Certification Practice Test

CLT CLT Hematology & Blood Analysis 2