Mary
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She has never mentioned (nor my previous doctor) that my MCV and MCH are always high.
High MCV and MCH very often (most often?) indicate a B12 and/or folate deficiency, which are characterized by a form of megaloblastic anemia (extra large red blood cells). My MCV was near the top of the normal range for years and years before a doctor mentioned its significance. I had been taking methylcobalamin for several years with no noticeable results, but when I started taking methylfolate in 2010, my energy markedly increased (as well as my need for potassium, which continues, but I don't care because low potassium is easy to remedy!)
However, my MCV has not come down in the last 6 years, though I feel better overall. I had been expecting it to drop. I recently came across something called thiamine-responsive megaloblastic anemia, which is supposed to be very rare, but is also characterized by high MCV. Symptoms include hearing loss and diabetes, as well as fatigue etc. (http://ghr.nlm.nih.gov/condition/thiamine-responsive-megaloblastic-anemia-syndrome) As the title indicates, this form of megaloblastic responds to thiamine supplementation. Symptoms generally manifest early in life. Well, I don't have diabetes but I have had some non-age related hearing loss (not too much) and also my blood sugar tends to be high-normal, despite being extremely careful about my diet. Recently I tried taking additional thiamine, and within 2 days had a great surge of energy. Unfortunately it didn't last, it's a long complicated story and this is already too long and complicated! But I just wanted to put it out there that in addition to, or instead of, a folate and/or B12 deficiency, you may be low in thiamine.