I'm new to the group. I'm in the midst of trying to convince my doctor that I have a B12 deficiency. My B12 blood serum level was in the "normal" range in 2014 and 2016. My peripheral neuropathy has improved greatly since taking subligual B12 for 45 days, averaging 12,000 mcg/day. I'm convinced that I'm B12 deficient. My doctor told me to stop taking B12 supplements for a week, then go in for a B12 blood serum test. I asked that a homocysteine blood test and a MMA urine test be added. She added just the homocysteine test.
My question: Does there need to be a longer period of time without taking B12 before taking the homocysteine blood test?
Any help would be appreciated.