After my last visit to the haematologist I did email him and ask him to test my MMA and homocysteine levels. I didn't get a response until today and then I received this.
'A brief note to confirm that I did receive your e-mail of May 14 via the NVH. The MMA and homocysteine levels were not available on the samples we had from May 1, but I did manage to rescue what was left of it on which to measure the "active" B12 level, the result of which came through to me last night -it was comfortably normal. Even so, I hope you have managed to obtain/take the oral B12 as discussed -what effect this has on your well-being and the the total and active B12 levels we can establish at your planned return visit on June 29.'
I assume if this is correct I am not B12 deficient despite my serum levels being below range at 154ng?
Any advice welcome.