High levels of vitamin B12 can occur in people who have liver disease e.g. hepatitis or cirrhosis and also people who have diabetes. The vitamin B12 test is not used as a diagnostic test. I think if you take certain medications that this can give a false B12 reading and certain supplements e.g. vitamin C can also falsify a result. It might be worth discussing the results with your doctor and maybe further testing to be on the safe side.
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