Process
The Schilling test has multiple stages. As noted below, it can be done at any time after vitamin B supplementation and body store replacement, and some clinicians recommend that in severe deficiency cases, at least several weeks of vitamin repletion be done before the test (more than one B shot, and also oral folic acid), in order to insure that impaired absorption of B (with or without intrinsic factor) is not occurring, due to damage to the intestinal mucosa from the conditions of malabsorption arising from B and folate deficiency themselves.
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