Hello. I have b12 deficiency but my Dr don't want to treat it and doesn't think that b12 deficiency is a problem. My symptoms are getting worse. I would like to do more tests like MMA and homocysteine but I do not know when they could be done after the injections to be accurate. I got 10 injections in June this year and nothing after that. Will those test be useless since I received some injections?