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The Vitamin B12 test measures a substance called methylmalonic acid (MMA) in the urine, which is a specific indicator of low B12 status. The more MMA you have, the more likely you are to be low in this critical nutrient.
Your Vitamin B12 test results are reported in specific units. The units are mmol MMA/mol creatinine (cr). Optimal vitamin B12 status is indicated when the result is below 2.0 mmol MMA/mol cr. A result above 3.8 mmol/mol cr means B12 status is very low and should be confirmed with further testing.
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