The patient has a total white blood cell (WBC) count of 600 cells/microliter. The differential shows a normal neutrophil level of 70% with 5% bands. This patient:
a. is at low risk for infection.
b. is at mild risk for infection.
c. is at moderated risk for infection.
d. is at severe risk for infection.
D
The differential demonstrates the percentage of each type of WBC circulating in the bloodstream. The absolute neutrophil count is calculated by multiplying the total WBC count (without a decimal point) by the percentages (with decimal points) of polymorphonuclear leukocytes (polys; also called segs or neutrophils) and bands (immature neutrophils).
WBC x (segs + bands)
600 x (0.70 + 0.05)
600 x 0.75 = 450 cells/microliter
This gives an actual number that is translated into the categories of mild, moderate, or severe neutropenia. Neutropenia is classified based on the patient's predicted risk for infection: mild (1000 to 1500 cells/microliter), moderate (500 to 1000 cells/microliter), and severe (<500 cells/microliter).
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