A nurse is teaching a client who has chronic kidney disease and a new prescription for epoetin alfa. The nurse should instruct the client to increase dietary intake of which of the following substances?

Choice A rationale Potassium intake does not directly impact the effectiveness of epoetin alfa therapy. While clients with chronic kidney disease often need to restrict potassium to prevent hyperkalemia due to impaired renal excretion, increasing it would not support red blood cell production. The normal potassium range is 3.5 to 5.0 mEq/L. The focus for this specific medication is providing the necessary building blocks for erythropoiesis, which occurs in the bone marrow in response to the hormonal stimulus. Choice B rationale While protein is necessary for overall cellular repair and hemoglobin structure, it is not the primary substance that needs supplementation during epoetin alfa therapy. In fact, many clients with chronic kidney disease must carefully monitor and sometimes limit protein intake to reduce the accumulation of nitrogenous waste products like urea. While a balanced diet is important, the specific mineral requirement for creating new red blood cells is more critical to ensure the medication works effectively. Choice C rationale Sodium intake should generally be restricted in clients with chronic kidney disease to manage fluid retention and hypertension, which are common complications of renal failure. Increasing sodium would lead to edema and increased cardiovascular strain. Sodium does not play a role in the production of hemoglobin or red blood cells. The goal of epoetin alfa is to treat anemia by stimulating the marrow, so nutritional interventions must target the specific requirements of red cell synthesis. Choice D rationale Epoetin alfa is a synthetic form of erythropoietin that stimulates the bone marrow to produce red blood cells. For this process to be successful, the body must have adequate stores of iron to synthesize hemoglobin. Without sufficient iron, the production of red blood cells will be limited, and the medication will be less effective. Clients are often prescribed iron supplements or instructed to increase dietary iron to support the increased demand for erythropoiesis during this treatment.