MMA is above range. This can indicate renal problems (so need to be ruled out by blood test) or SIBO (small intestine bacterial overgrowth) - which can rob you of B12 and other vitamins, and can be ruled out by a fasting breath-test series ....... or it can indicate B12 deficiency.
This is why it is used as a secondary test if a B12 test result is borderline, but deficiency is suspected (on NICE advice).
My MMA tests showed constant levels of 350- 400 nmol/L (range 0-280 nmol/L) after B12 injections started, then dropped into range for my 6th and final MMA test, but it took 3 years to get there. My GP found raised MMA unusual and had only seen 2 cases in her career - but the Adult Inherited Metabolic Diseases consultants, who did my last test, were more familiar with it and had seen MMA many times higher than mine, which explains why mine was considered "raised" not high. I have no idea what my MMA was like before being given B12 injections.
Since my B12 injection frequency was increased, after the first test, to twice a week, I can only assume that it was this action that finally normalised my MMA. Nothing else as cause was found - renal problems being eliminated previously and SIBO later on. All else that may have explained even some of my symptoms was ruled out along the way (bowel cancer, Coeliac disease etc). No additional medication involved as nothing else found to treat.
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