Epoetin is used to treat anemia in chronic kidney disease because the kidneys play a major role in blood cell production. What does epoetin stimulate?

• A. Red blood cell production
• B. White blood cell production
• C. Platelet production
• D. Hormone secretion from the pituitary

Answer: (A)

Erythropoietin stimulates red blood cell production. It acts on erythroid progenitor cells in the bone marrow to proliferate and mature into erythrocytes, increasing the circulating red blood cell mass. In chronic kidney disease, reduced kidney production of erythropoietin leads to anemia, so giving epoetin—a synthetic form—replaces that signal and boosts erythropoiesis, raising hemoglobin and hematocrit. This effect is specific to red blood cells; white blood cell production and platelet production are governed by different factors, and pituitary hormone secretion involves separate pathways. Clinically, monitor hemoglobin to avoid polycythemia and ensure iron stores are adequate, since iron is needed for effective red blood cell production.