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A 32-year-old female asked:

B12 level of 1123 pmol/l (upper limit: 700). is this a cause for concern? cbc and other labs normal, except for lymphocyte % of 24 (lower limit of 25)

1 doctor answer1 doctor weighed in
Dr. Robert Kwok
Pediatrics 33 years experience
Taking vitamins: A blood level of vitamin B12 above the lab's reference range usually just means patient is taking vitamin supplements, especially if taking vitamin B12 injections. Reference Range is the range of lab results for 95% of a group of normal healthy people. That means 2.5% of the normal people in that group will have a result above range, and 2.5% of the normal people in that group will be below range.

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Last updated Mar 21, 2019

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