MRCP Part 1 - Membership of the Royal College of Physicians MRCP Part 1 Haematology, Infectious Disease & Dermatology
A 70-year-old man has a haemoglobin of 70 g/L, MCV 120 fL, and hypersegmented neutrophils on blood film. Vitamin B12 is low. What is the most likely cause of B12 deficiency?