Given a WBC count of 5,500/µL, lymphocytes at 20%, and CD4 cells at 25% of lymphocytes, what is the absolute CD4 count?

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Multiple Choice

Given a WBC count of 5,500/µL, lymphocytes at 20%, and CD4 cells at 25% of lymphocytes, what is the absolute CD4 count?

Explanation:
Calculating absolute counts from percentages requires two steps. First, find how many lymphocytes are present per microliter: 20% of the total WBC count is 5500 × 0.20 = 1100/µL. Then determine how many of those lymphocytes are CD4 cells: CD4 cells are 25% of lymphocytes, so 1100 × 0.25 = 275 CD4 cells/µL. The absolute CD4 count is 275/µL.

Calculating absolute counts from percentages requires two steps. First, find how many lymphocytes are present per microliter: 20% of the total WBC count is 5500 × 0.20 = 1100/µL. Then determine how many of those lymphocytes are CD4 cells: CD4 cells are 25% of lymphocytes, so 1100 × 0.25 = 275 CD4 cells/µL. The absolute CD4 count is 275/µL.

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