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MediumHaematologyVitamin B12 Deficiencyukmlamrcp part 1mrcgp aktpane

A 42-year-old man presents with fatigue and generalised 'achiness'. Routine blood tests show: Haemoglobin 105 g/L, MCV 108 fL, Platelets 120 x 10⁹/L, White cell count 3.5 x 10⁹/L. A blood film report notes hypersegmented neutrophils. What is the most likely underlying deficiency?

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