A nurse is caring for a client who has been taking epoetin alfa for 3 months. Which of the following laboratory tests should the nurse monitor to determine the effectiveness of the medication?

B. Hemoglobin levels should be monitored regularly to assess the effectiveness of epoetin alfa therapy. Epoetin alfa stimulates the production of red blood cells, which should result in an increase in hemoglobin levels over time in clients with anemia. Monitoring hemoglobin levels helps determine if the medication is achieving the desired therapeutic effect. A. Thrombin time measures the time it takes for a clot to form in a blood sample after thrombin is added. It is primarily used to assess abnormalities in the conversion of fibrinogen to fibrin during the clotting process. Thrombin time is not typically monitored to assess the effectiveness of epoetin alfa. C. AST is an enzyme found primarily in the liver and heart. Elevated AST levels may indicate liver or heart damage but are not specifically related to the effectiveness of epoetin alfa therapy. AST is not routinely monitored to assess the effectiveness of epoetin alfa. D. Troponin is a cardiac biomarker used to diagnose myocardial infarction (heart attack). Elevated troponin levels indicate damage to the heart muscle. Troponin levels are not directly related to the effectiveness of epoetin alfa therapy and are not routinely monitored for this purpose.