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Malabsorption: As per findings from the study by Carmel, R
Symptoms (fatigue, weakness), physical exam notes, and lab test results such as CBC and ferritin levels
Many payers and CMS reviewers flag unspecified codes as potential underdocumentation
Intramuscular injections of B12 are administered during the first stage of the test, an hour after the patient takes an oral dose of radiolabeled vitamin B12
That is the evidence gap, stated plainly: the mechanism is well-motivated and the preclinical signal is consistent, but no human study has confirmed that any of it translates to people, at any dose, by any route
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