In anemia classified as underproduction of red blood cells, the primary issue is what?

• A. Defective RBC production
• B. Increased RBC destruction
• C. Excess RBC production
• D. Decreased plasma volume

Answer: (A)

Underproduction of red blood cells means the bone marrow isn’t making enough erythrocytes. The primary issue is defective RBC production in the marrow, so the marrow often shows a low reticulocyte count because it isn’t responding by releasing new red cells into the bloodstream. This can happen with marrow damage or suppression (such as aplastic anemia or chemotherapy), or with nutritional deficiencies (iron, B12, or folate) and other problems that impair erythropoiesis.

This differs from destruction-based or dilution-based causes. If RBCs are being destroyed faster than they’re made (hemolysis), the body typically tries to compensate by increasing production, so reticulocytes rise. Excess RBC production is not compatible with anemia. Dilutional anemia from decreased plasma volume isn’t a production problem at all; it changes the apparent RBC concentration without reflecting true RBC mass or marrow production.