Prevalence of Vitamin B12 Deficiency
Plasma <118 pmol/l - NDNS
A serum vitamin B12 of 118pmol/l is equivalent to 154pg/ml
Macrocytosis (MCV >101fl) was seen in: 1-3% of teenagers, 9% of adults,
2% of free-living elderly and 3% of elderly in institutions.
Macrocytosis is often due to alcohol excess and not vitamin B12 deficiency