A patient presents with generalized weakness, headache, and difficulty concentrating. Laboratory tests reveal normocytic normochromic anemia, normal iron studies, and elevated serum erythropoietin levels. Which of the following conditions is most likely to cause these findings?
Correct Answer: A
Rationale: The patient in this scenario presents with normocytic normochromic anemia, normal iron studies, and elevated serum erythropoietin levels. These findings are characteristic of anemia of chronic disease, which is commonly seen in patients with chronic kidney disease (CKD). In CKD, there is a decrease in renal production of erythropoietin, leading to reduced stimulation of erythropoiesis and subsequent anemia. The normocytic normochromic anemia pattern is typical in anemia of chronic disease, as opposed to microcytic hypochromic anemia seen in iron deficiency anemia and thalassemia. Aplastic anemia is characterized by pancytopenia, which is not described in the scenario. Therefore, the most likely cause of the patient's presentation is chronic kidney disease.