I have just been doing some reading after GP said intrinsic factor and parietal cell antibodies could be tested for. I am so angry no one suggested this before as I've had all of the damned symptoms of B12 deficiency for years....anyway ...
This explains why auto immune suffers can't get their B12 from their food efficiently. Intrinsic factor is produced by the parietal cells and this along with with stomach acid (low in auto immune conditions) is the mechanism required to extract B12.
pernicious-anaemia-society....
The problem here is those of us with auto immune disease don't know the miriad of things that can go wrong and we have illness creep up on us - our doctors should be completely aware of the implications of auto immune disease and watch out for all of these issues...
Sorry rant over ... had to get this off my chest.
PS the reason this illness used to be called 'Pernicious' is because people died from it until treatment was found.