Hi there, I'm new here so apologies if this is in the wrong place. Basically my sister has had symptoms for years, that point to pernicious anemia. Doctors haven't taken it very seriously and pretty much none of the treatment has worked, she's miserable and desperate. She had a brief improvement from sublingual b12 dissolvable tablets, but was then put on normal b12 tablets and went straight back to being ill. Her latest blood test showed 'normal' b12 levels in her blood despite all of the symptoms returning, so Doctors are refusing to take it any further.
So my question is - can she have 'normal' b12 levels in her blood but still be deficient due to the difference between active and inactive b12? How has her blood level of b12 improved when none of her symptoms have? And if her blood levels of b12 have improved does that mean it's not pernicious anemia?
Thank you in advance for your help, you guys seem like you really know your stuff!