Leukocyte Quiz: WBC Differential Count Practice Questions

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Questions and Answers

What percentage of total leukocytes are neutrophils in an adult?

20 – 30

2 – 10

1 – 4

50 – 70 (correct)

What is the typical diameter of a neutrophil?

20 – 25 µm

14 – 19 µm

10 – 12 µm (correct)

6 – 8 µm

What is the shape of the nucleus in a monocyte?

Round

Irregular

Kidney-shaped (correct)

Lobulated

What is the function of the granules in the cytoplasm of neutrophils?

To liberate enzymes to kill bacteria Signup and view all the answers

What is the term for leukocytes with nuclei consisting of multiple lobes?

Polymorphonuclear leukocytes Signup and view all the answers

What percentage of total leukocytes are lymphocytes in an adult?

20 – 30 Signup and view all the answers

What is the purpose of adding cedar wood oil to the smear?

To enable the use of oil immersion lens Signup and view all the answers

What is the typical percentage of eosinophils in total WBCs?

1-4% Signup and view all the answers

What is the minimum number of white blood cells that should be counted for a reliable result?

100 Signup and view all the answers

What is the characteristic shape of the nucleus in basophils?

S-shape Signup and view all the answers

What is the term for an increase in the number of circulating neutrophils?

Neutrophilia Signup and view all the answers

What is the reason for a slight increase in neutrophils under physiological conditions?

All of the above Signup and view all the answers

What is the primary function of lymphocytes?

Antibody formation Signup and view all the answers

What is the purpose of the Leishman's stain in the blood film preparation?

To identify the different types of white blood cells Signup and view all the answers

What is the typical size range of small lymphocytes?

6-8 µm Signup and view all the answers

What is the final step in the differential count of white blood cells?

Expressing the result in absolute numbers Signup and view all the answers

What is unique about the cytoplasm of monocytes?

It has a 'ground-glass' appearance Signup and view all the answers

What is the normal percentage of monocytes in total WBCs?

2-10% Signup and view all the answers

Which of the following conditions is associated with eosinopenia?

Acute pyogenic infections Signup and view all the answers

Which of the following is a cause of neutropenia?

Drugs like chloramphenicol Signup and view all the answers

Which of the following diseases is associated with monocytosis?

Infectious mononucleosis Signup and view all the answers

Which of the following conditions is associated with lymphocytosis?

Chronic infections Signup and view all the answers

Which of the following is a cause of basophilia?

Chronic myeloid leukemia Signup and view all the answers

Which of the following conditions is associated with lymphocytopenia?

Patients on ACTH and steroid therapy Signup and view all the answers

Study Notes

Leukocytes

There are 5 types of leukocytes: neutrophils, eosinophils, basophils, lymphocytes, and monocytes.

Polymorphonuclear Leukocytes

Have nuclei consisting of a number of lobes
Also called granulocytes due to small granules in their cytoplasm
3 types: neutrophils, eosinophils, and basophils

Neutrophils

Diameter: 10-12 µm
Nucleus: 2-5 lobes, densely staining
Cytoplasm: fine dark-blue or purple granules, lysosomal in nature, able to kill bacteria
Percentage: 50-70% of total WBCs

Eosinophils

Diameter: 10-12 µm
Nucleus: usually 2 lobes
Cytoplasm: densely packed with large oval granules, staining bright red or orange
Percentage: 1-4% of total WBCs

Basophils

Diameter: 8-10 µm
Nucleus: irregular, divided into 2 lobes (S-shape)
Cytoplasm: contains dark-blue granules, containing heparin and histamine
Percentage: <1% of total WBCs

Lymphocytes

Concerned with antibody formation
Two forms: small (6-8 µm) and large (12-16 µm)
Small lymphocytes: round nucleus, densely staining condensed chromatin, thin rim, blue cytoplasm
Large lymphocytes: more plentiful cytoplasm, staining pale blue, sometimes showing a few granules
Percentage: 20-45% of total WBCs

Monocytes

Largest white blood cells
Nucleus: irregular shape, fine chromatin, often kidney-shaped (Reni form)
Cytoplasm: blue-gray color, "ground-glass" appearance, contains lysosomal granules and vacuoles
Percentage: 2-10% of total WBCs

Differential Leukocyte Count

Performed by examining a blood film stained with Leishman's stain under immersion oil
Apparatus and reagents: glass slide, Leishman's stain, cedar wood oil, microscope
Procedure: prepare and stain blood film, examine under immersion oil, count at least 100 WBCs, record count, and calculate percentage of each type of cell

Variations in Leukocyte Count

Neutrophilia (increase in neutrophils): seen in acute pyogenic infections, physiological conditions, and certain diseases
Neutropenia (decrease in neutrophils): seen in typhoid and paratyphoid fever, malaria, aplastic anemia, and certain drug treatments
Lymphocytosis (increase in lymphocytes): seen in chronic infections, tuberculosis, and whooping cough
Lymphocytopenia (decrease in lymphocytes): seen in patients on ACTH and steroid therapy
Eosinophilia (increase in eosinophils): seen in allergic conditions, pulmonary eosinophilia, and intestinal infestation with worms
Eosinopenia (decrease in eosinophils): seen in acute pyogenic infections and patients on ACTH and steroid therapy
Basophilia (increase in basophils): seen in chronic myeloid leukemia, small pox, and polycythemia
Monocytosis (increase in monocytes): seen in infectious mononucleosis, malaria, and kala azar

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Description

Test your knowledge of the different types of leukocytes, including their characteristics, size, and percentage of total leukocytes in adults. Identify the different types of white blood cells, such as neutrophils, eosinophils, basophils, lymphocytes, and monocytes.

Differential Leukocyte Count Quiz

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