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Serum vitamin B12 measurement forms the cornerstone of diagnosis, with levels below 148 pmol/L (200 ng/L) generally considered deficient, though symptoms can occur at higher levels
According to PubMed: A systematic review of elevated B12, cancer and mortality (2024) What was found: a team at Pontificia Universidad Javeriana in Bogota pooled thirteen studies of adults with abnormally high B12
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