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Review Question - QID 107172

Anemia of Chronic Disease Evaluation Labs QID: 107172 (M2.HE.15.4671)
In scope icon M 6 E
QID 107172 (Type "107172" in App Search)
A 63-year-old man presents to urgent care with a 1-month history of increasing fatigue. He first noticed fatigue when he was hiking with his friends but got concerned when he started having fatigue even with daily activities. He lives alone and has not seen a doctor in over 10 years. His medical history is significant for diabetes, but he does not currently take any medications. He does not exercise, eats a poor diet, and drinks 1-2 beers per day. He does not smoke. He has never had a colonoscopy. His temperature is 98.6°F (37°C), blood pressure is 135/81 mmHg, pulse is 82/min, and respirations are 12/min. Labs are obtained with the following results:

Hemoglobin: 8.9 g/dL
Mean corpuscular volume: 70 fL
Ferritin: 400 ng/mL
TIBC: 200 micrograms/dL
Iron: 50 micrograms/dL

Which of the following is the most likely cause of this patient's symptoms?
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