Vitamin B12 ... A blood test can measure B12 levels and identify anaemia. In some cases, additional tests, such as methylmalonic acid (MMA) or homocysteine levels, may be required for confirmation.
The authors say that even persons with vitamin B12 ... signs of vitamin B12 deficiency. They recommend measuring biomarkers (serum holotranscobalamin, plasma methyl malonic acid, and plasma ...
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