Thank you for your replies Taka and Foggyme. B12 injections have relieved my extreme fatigue, the main symptom I experienced.
Several years ago my Active B12 & MMA were analysed at St Thomas Hospital (twice) and found to be in the "grey area", but no action or further monitoring was taken by GP's.
I have checked my serum B12 since commencing B12 injections; and as expected was high in the reference range. I wondered if it would be worth my expense to find out if my MMA has reduced since on B12 injections so that it may be a guide to the future.
I am just curious really,(to compare with previous MMA tests).
Life has been tough to get low B12 recognised, by the NHS. I have been concerned about B12 deficiency since 2013 & 2014, only when I produced a further (private) test revealing borderline B12 202 ref (197 - 771), in 2016, were B12 injections commenced. G.P did check FBC & vitamin D, which were considered normal. Intrinsic Factor Antibodies were not requested by the surgery; and I hastily had to arrange IF Antibody test before loading doses commenced. Intrinsic Factor Antibodies were found to be Positive, (by the private sector). I have since repeated the IF test and it was again Positive.
Thanks for all your valued information.