Low vitamin B12 result

B12 is low. Treat the deficiency, then find out why it is low.

One page, every threshold with its number and unit. Written and reviewed by practising UK GPs. Last reviewed 29 Jul 2026.

This sheet puts the whole decision on one page: the thresholds that change what you do, each with its number and unit, and the sources each one was checked against.

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Inside the full sheet 🔒 Thresholds, numbers and units 🔒 Sources checked against the guideline

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Related Ocean Article: Vitamin B12 and Folate Deficiency · also Assessment & Management of Anaemias. Part of the GP reference sheets, result interpretation one page per test or finding.

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