Ranges vary: Reference ranges for homocysteine vary some from lab to lab. Most physicians today set little by this number, as an atherosclerosis risk or otherwise, unless it is very far above the upper limit you've cited. Of your many listed problems, the one that concerns me is papilledema / blurry vision; i'm concerned you have pseudotumor cerebri and this vitamin ; lab test stuff diverts the investigation.
Answered 1/17/2014
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