Work out vitamin b12 deficiency risk instantly with clear inputs, formula shown and shareable results.
Bands a serum vitamin B12 level, converts it to SI units and notes when methylmalonic acid testing is needed to confirm functional deficiency.
B12 interpretation
pmol/L = pg/mL x 0.7378. Deficiency under about 150 pmol equivalent, indeterminate 150-300, with methylmalonic acid or homocysteine used to resolve the grey zone
Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
Most circulating B12 is bound to haptocorrin and unavailable to cells, so functional markers detect deficiency the total level misses.
Long-term metformin and proton pump inhibitors both reduce absorption over years.