A patient with chronic kidney disease (CKD) develops anemia. The nurse explains to the patient that anemia in CKD is primarily due to which cause?

A. Escape of red blood cells through damaged glomeruli: Hematuria can occur in some kidney diseases, but the loss of red blood cells through glomerular damage is usually minimal and does not account for the chronic anemia seen in CKD. This mechanism is not the primary cause of anemia in these patients. B. Minimal production of erythropoietin by the kidney: The kidneys produce erythropoietin, a hormone that stimulates bone marrow to produce red blood cells. In CKD, damaged renal tissue reduces erythropoietin synthesis, leading to decreased red blood cell production and anemia. This is the most common and primary cause of anemia in CKD patients. C. Decrease absorption of Vitamin B12 and folic acid: Vitamin B12 and folate deficiencies can contribute to megaloblastic anemia, but absorption is usually unaffected by CKD. Nutritional deficiencies are secondary contributors and not the main cause of anemia in chronic kidney disease. D. Interference with transportation of iron to bone marrow: While CKD may cause functional iron deficiency due to inflammation and hepcidin elevation, iron transport interference is a contributing factor, not the primary cause. The key driver of anemia in CKD remains low erythropoietin production.