NAPLEX (North American Pharmacist Licensure Examination) Practice Exam

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Myelosuppression results in a decrease in what?

  1. Only WBC

  2. Only RBC

  3. WBC, RBC, PLT

  4. Only PLT

The correct answer is: WBC, RBC, PLT

Myelosuppression is the decrease in blood cell production in the bone marrow, leading to low levels of all types of blood cells including white blood cells (WBC), red blood cells (RBC), and platelets (PLT). Option A and B are incorrect because they only mention one type of blood cell that is affected by myelosuppression. Option D is incorrect because it only mentions platelets and not the other types of blood cells. The correct answer, option C, includes all the types of blood cells affected by myelosuppression.