My serum B12 levels have been dropping slowly in the last 3 years with memory loss, poor cognitive function, exhaustion, continuous infections etc. However one off tests for methylmalonic acid and total homocysteine have been normal, so my new doctor is saying I do not have a true B12 deficiency. Has anybody experienced this? Are there any health conditions or tests which can cause a low serum B12 result?
Oddly, my iodine is low, but all other extensive tests are normal.
Luckily my doctor has recommended loading B12 injections to see if my symptoms resolve. So far I have only been given 3 injections with only a small improvement in fatigue.