A 49-year-old female asked:
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what causes extremely high serum vit b12 levels? mine was 11,500! (max is 900). 2 years ago my levels were low, 158. dr referring me to hematologist.

1 doctor answer
Dr. Matthew Fero
30 years experience Medical Oncology
Supplements?: On its own elevated B12 is not very meaningful and might just be a result of vitamin supplements. Some kinds of leukemia and liver disease can cause high levels but these are easily picked up on blood tests. If you are taking vitamin supplements, I'd lay off those and recheck the B12 in a month.
Answered on Jan 16, 2015
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