I have been having b12 injections through my GP every 8 weeks for around 2yrs, after a diagnosis of low b12 levels (around 160). Luckily I am able to absorb b12 via tablets, so as well as my injections I supplement myself with a minimum of 1000mcg most days. If I don't supplement myself then within a week or two of my injection all my symptoms start to come back. I was never given any loading doses by my GP and recently they have been questioning my request to have an injection every 8 weeks, when the guidelines say that 12 weeks should be sufficient.
As a result, they asked me to have a blood test 6 weeks after my last injection. My understanding was that this was fairly pointless as once you are on injections your levels should be in the 1000s and the b12 should stay in your system for a couple of months. I didn't take any extra supplements for 5 weeks after my injection but by this time was feeling horrendous, so for two days running I took 2000mcg to try and top me up until after the blood test when I could start taking my supplements again.
I've just had the results of my test and my b12 level was 511 - am I correct in thinking that this is low for someone on injections who also took supplements the week before the test?
As I can absorb b12 through my digestive system, I know that I do not have pernicious anaemia and believed that my problem was always with the storage of b12 instead. Does the blood test result support this theory?
Luckily for the moment they have not said anything about changing the frequency of my injections but I am waiting with baited breath for the call from my GP as the nurse who gave me the results said they were 'perfectly normal'.
Thanks in advance for any guidance you can give me - I have done so much research on PA but I am not too sure what applies to me and what doesn't seeing as I am able to absorb it!