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A serum B 12 concentration below 148 pmol/L (depending on the assay) with symptoms (box 1) is a strong indication of deficiency and is sufficient to start treatment

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Access your blood results via your GP, alternatively self perform blood tests can be delivered to your home from one of the companies below

A complete blood count (CBC), given as part of a routine physical examination, can provide some clues that vitamin B12 levels may be low