Hi I have just got my results back from medichecks for active B12 which is 256 pmol/L which they say it's high. I'm not on any supplement and the reason I had the test done is because I am having all the symptoms of B12 deficiency. How can this be? I have brain fog, anxiety, I can't remember things and names, I can't retain information, I can't sleep, I have recurring sores in the corners of my lips, pins and needles in hands and arms and feel confused. Also titinnus in my ears and joint pain. Sometimes I have an electric shock type of pain down my leg. I had low ferritin (although within range) and took iron tablets for a while. I stopped these a few months ago as Dr suggested to stop them and see if the symptoms came back. Had brain fog before but never the tingling in hands and arms. In the past I also have shortness of breath and extreme tiredness and got these now. Can I be B12 deficient when active B12 is normal/high?
Had my thyroid removed due to Graves disease 4 years ago. I'm on thyroxine but latest TSH/T4 in range, if anything T4 towards the higher end but in range. So desperate to understand what's going on.