Was MMA and/or homocysteine tested and what were the results?
More than half of the respondents who knew their results had a too high value of MMA in the blood in accordance with the average reference value that is used in the Netherlands and were therefore very probably B12 deficient.
MMA in urine
Over a quarter of the patients who had their MMA measured in urine clearly had too high values (and certainly a B12 deficiency) and 35.6 % were in the so called grey area where the results cannot be considered decisive.
Of the respondents who knew their homocysteine results, approximately a third had definite high values, clearly indicating a B12 deficiency. A good homocysteine value cannot exclude a vitamin B12 deficiency.