A client with anemia secondary to chronic kidney disease (CKD) started a prescription for epoetin alfa two months ago. Which client finding best indicates that the medication is effective? Reference Range: Hemoglobin (Hgb) [14 to 18 g/dL (8.7 to 11.2 mmol/L)

A) Reports of increased energy levels and decreased fatigue: While increased energy and decreased fatigue can be positive signs of treatment effectiveness, they are subjective and can be influenced by various factors unrelated to hemoglobin levels. B) Takes concurrent iron therapy without adverse effects: This indicates that the client is tolerating their treatment, but it does not directly measure the effectiveness of epoetin alfa in increasing red blood cell production or improving anemia. C) Food diary shows increased consumption of iron-rich foods: Increased dietary intake of iron can support treatment for anemia, but it does not provide a definitive measure of the effectiveness of epoetin alfa specifically. D) Hemoglobin level: The most direct indicator of the effectiveness of epoetin alfa is an increase in hemoglobin levels. The purpose of administering this medication is to stimulate erythropoiesis, thereby raising hemoglobin levels in clients with anemia, especially in those with chronic kidney disease. Monitoring the hemoglobin level provides objective evidence of how well the medication is working.