Vitamin B12 Deficiency Urine Test | Dr. Schweikart
As a result, the MMA urine test is seen as the most reliable method for determining vitamin B12 deficiency, alongside the the holo TC test. Vitamin B12 Deficiency Urine Test: Method and Cost The MMA urine test is very simple to perform; a sample of the morning urine is all that is required. This is then sent to a corresponding lab for testing.
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