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Undetected vitamin B12 deficiency due to false normal assay ...ncbi.nlm.nih.gov › articles › PMC3827408 by E Scarpa · 2013 · Cited by 25 — Although measurement of vitamin B12 levels is the gold standard for the diagnosis of B12 deficiency some reports do exist concerning difficulties in its assay–

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Individual circumstances may vary, and only a healthcare professional who knows your medical history can provide personalised guidance