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ModerateHematologyIron Deficiency Anemiaus-abfmus-abimus-usmle-step-2us-usmle-step-3

A 56-year-old woman presents with fatigue and dyspnea on exertion. CBC shows Hb 8.5 g/dL, MCV 70 fL, and ferritin 6 ng/mL. She has heavy menstrual bleeding but no GI symptoms. Which is the most appropriate initial diagnostic approach?

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