Sure hope someone can give me their insight. As I've posted previously, my B12 level is very high (greater than 2000). I developed many symptoms of a B12 deficiency and took methyl B12 for several months. I felt better but my level never dropped. I do have MTHFR and hypothyroidism. Recently I had to reduce my thyroid med and add in straight T3 as my body wasn't converting the T4 to T3. I've had lab work several times since then and now my RBC, hemoglobin, and hemotacrit is elevated. With these levels being elevated along with my B12 level being so high, my doctor referred me to a hematologist. I've had a homocysteine test twice, a MMA serum test, and waiting on the results of an MMA urine test. The former two were normal. My MCV and MCH is normal as well along with my other CBC levels including my WBC. I know B12 is needed for the thyroid to function properly. If I had anemia from a B12 deficiency, my RBC, hemoglobin, and hematocrit should be low. I am at a loss as to what is going on or how to fix it, especially the B12 level. I can say that my RBC, hemoglobin, and hematocrit have only gone up since I dropped my thyroid med and added T3. Research states that HYPERthyrodism can cause this. I am still hypo and not hyper per lab results. I feel the high B12 levels and other high levels are connected in some way. Does anyone have a clue what might be happening?