Q: Which equation would you use to calculate the percentage of lymphocytes in a CBC with differential if the total leukocyte count is $$W$$ and the lymphocyte count is $$L$$?

Percentage of lymphocytes $$= \frac{L}{W} \times 100$$

Q: Which formula would you use to calculate the absolute neutrophil count (ANC) if the total leukocyte count is $$W$$ and the percentage of neutrophils is $$N\%$$?

ANC $$= W \times \frac{N}{100}$$

Question 1

Which of the following best describes the initial physical barrier that prevents most viruses from infecting the human body?

Accepted Answer

Epithelial cells lining the respiratory tract

Question 2

During a viral infection such as the common cold, which type of leukocyte is most likely to be elevated in a complete blood count with differential?

Accepted Answer

Lymphocytes

Question 3

A patient presents with elevated neutrophil counts in their CBC with differential. Which of the following is the most likely cause?

Accepted Answer

Bacterial infection

Question 4

Which immune cell is primarily responsible for producing antibodies after activation in lymphoid tissues?

Accepted Answer

Plasma cell

Question 5

If a patient has elevated eosinophil levels in their CBC with differential, which condition is most likely present?

Accepted Answer

Parasitic infection or allergic reaction

Question 6

Which of the following best explains why a CBC with differential is more informative than a CBC alone?

Accepted Answer

It identifies which type of leukocyte is elevated, helping to narrow down the cause of inflammation.

Question 7

Which equation would you use to calculate the percentage of lymphocytes in a CBC with differential if the total leukocyte count is $$W$$ and the lymphocyte count is $$L$$?

Accepted Answer

Percentage of lymphocytes $$= \frac{L}{W} 	imes 100$$

Question 8

Which immune response is most likely to be triggered by the virus that causes the common cold?

Accepted Answer

Activation of lymphocytes and production of antibodies

Question 9

A patient with cancer is likely to have which immune cells involved in targeting and destroying cancer cells?

Accepted Answer

Cytotoxic T cells and natural killer cells

Question 10

Which of the following is a plausible reason why inflammation is considered nonspecific in a CBC?

Accepted Answer

Elevated leukocyte count does not indicate the exact cause of inflammation.

Question 11

Which scenario best illustrates the application of a CBC with differential in a real-world medical case?

Accepted Answer

A physician uses the differential to distinguish between bacterial and viral causes of a patient's fever.

Question 12

Which of the following best describes the role of dendritic cells in the immune response to cancer?

Accepted Answer

They present antigens from cancer cells to activate cytotoxic T cells.

Question 13

Which formula would you use to calculate the absolute neutrophil count (ANC) if the total leukocyte count is $$W$$ and the percentage of neutrophils is $$N\%$$?

Accepted Answer

ANC $$= W 	imes \frac{N}{100}$$

Question 14

Which of the following is a multi-step process that occurs during the immune response to a bacterial infection?

Accepted Answer

Neutrophils migrate to the site of infection, phagocytose bacteria, and release cytokines to recruit more immune cells.

Question 15

Which of the following best explains why viral pathogens tend to induce a lymphocyte-dominant response?

Accepted Answer

Lymphocytes are specialized for recognizing and eliminating cells infected by viruses.

Question 16

Which immune cell is most likely to be elevated in a patient with allergies, according to a CBC with differential?

Accepted Answer

Eosinophils

Question 17

Which of the following is a critical insight gained from a CBC with differential in diagnosing infections?

Accepted Answer

The type of leukocyte elevated can help distinguish between bacterial, viral, and parasitic infections.

Question 18

Which of the following best describes the activation of naive B cells during a viral infection?

Accepted Answer

Naive B cells are activated in lymphoid tissues and organs, leading to antibody production.

Immune Responses: Viral, Bacterial, and Cancer Cell Defense & Clinical Blood Analysis

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