and homocysteine are a much more sensitive diagnostic clue than a low serum B12 level in the Image results diagnosis of gag, |850|| throat and deep vitamin B12. Thus, an elevated MMA level is viewed as a more specific marker for vitamin B12 deficiency except in chronic renal failure, in which
MMA increases. They recommend also testing for elevated levels of homocysteine and methylmalonic acid (MMA), two precursors to the metabolic reactions controlled by B12.. MCV is usually strikingly elevated, between 110 and 140 fL.. Whereas 
the normal vitamin B12 level is 150350 pgmL, most patients with overt vitamin. Vitamin B12 level too high? Vitamin and Mineral Deficiency. Elevated
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acid and homocysteine are a much more sensitive diagnostic clue than a low serum B12 level in the diagnosis
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B12. Vitamin B12 levels are tested in different ways with different accuracies. Serum B12 by radioimmune assay
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is less accurate than microbial assay since. One group, followed beyond this time, exhibited elevated levels through twenty-seven days with return to levels existing before the
test at the thirtieth. Conclusion: This study revealed 