[37] PA may be considered as an end stage of autoimmune atrophic gastritis, a disease characterised by stomach atrophy and the presence of antibodies to parietal cells and intrinsic factor
For example, if your Hb is low, and your MCV is raised, and then put on B12, and the Hb rises and MCV falls, there's the answer
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Contamination is not always visible
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Do vitamin D and B12 work together