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MediumHaematologyIron Deficiency Anaemiaukmlamrcgp aktpanemrcp part 1

A 68-year-old man is found to have iron deficiency anaemia (Hb 98 g/L, MCV 72 fL, Ferritin 10 µg/L). He denies any overt bleeding or change in bowel habit. What is the most appropriate next investigation?

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