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EasyHematologyIron deficiency anemiaus-abfmus-abimus-usmle-step-2

A 50-year-old man presents with fatigue and exertional dyspnea. Physical exam reveals conjunctival pallor. Lab studies show hemoglobin 9.2 g/dL, mean corpuscular volume 70 fL, ferritin 8 ng/mL, and serum iron low with elevated total iron-binding capacity. Which of the following is the most likely diagnosis?

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