As the nurse caring for a patient with chronic kidney disease, you know that one of the causes of anemia in CKD is which of the following?

A. Increase hydrogen ions in blood is incorrect because metabolic acidosis (accumulation of hydrogen ions) can occur in CKD but does not directly cause anemia. It contributes more to bone demineralization and other metabolic disturbances rather than affecting red blood cell production. B. Decreased erythropoietin production is correct because the kidneys produce erythropoietin, a hormone that stimulates the bone marrow to produce red blood cells. In CKD, damaged kidneys cannot produce sufficient erythropoietin, leading to decreased red blood cell production and anemia. This is the most common cause of anemia in CKD and often requires treatment with recombinant erythropoietin or iron supplementation. C. Change in white blood cell function is incorrect because alterations in white blood cells may occur with CKD-related immune dysfunction, but they do not cause anemia. Anemia is specifically related to red blood cell production and lifespan. D. Hyperinsulinemia is incorrect because elevated insulin levels are not directly linked to anemia in CKD. Insulin abnormalities are more commonly associated with metabolic syndrome or diabetes, which may coexist with CKD but are not primary causes of anemia in this condition.