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EasyHaematologyVitamin B12 Deficiency Anaemiamrcgp aktukmlapanemrcp part 1

A 24-year-old woman complains of persistent tiredness for the last 3 months. She follows a vegan diet. Full blood count reveals: Hb 105 g/L (115-165), MCV 108 fL (80-100), Platelets 150 x10^9/L, WCC 4.5 x10^9/L. Blood film shows macrocytosis and hypersegmented neutrophils. What is the most likely deficiency causing this anaemia?

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