A nurse is evaluating the laboratory values of a client who is receiving epoetin alfa. Which of the following findings indicates a therapeutic response to the medication?

A) "Increased erythrocyte sedimentation rate.": An increase in the erythrocyte sedimentation rate (ESR) indicates inflammation or the presence of disease but does not reflect a response to epoetin alfa, which aims to increase red blood cell production. B) "Increased neutrophil count.": Epoetin alfa primarily stimulates erythropoiesis (red blood cell production) and does not significantly affect neutrophil counts. Therefore, an increased neutrophil count is not a relevant therapeutic response. C) "Increased platelet count.": Epoetin alfa is not directly aimed at increasing platelet counts. While it can have some indirect effects on platelets due to increased hematocrit, a higher platelet count alone does not indicate a therapeutic response to this medication. D) "Increased hemoglobin level.": An increased hemoglobin level is the primary therapeutic target of epoetin alfa. This medication is used to treat anemia, particularly in patients with chronic kidney disease or those undergoing chemotherapy, by stimulating the production of red blood cells and thus raising hemoglobin levels.