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EasyHaematologyIron Deficiency Anaemiamrcgp aktukmlapanemrcp part 1

A 28-year-old woman presents with persistent fatigue and shortness of breath on exertion. Her full blood count reveals: Hb 108 g/L, MCV 75 fL, MCH 24 pg. What is the most appropriate next investigation to confirm the suspected diagnosis?

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