A patient has a decreased vitamin B₁₂ assay.The Schilling test detects labeled vitamin B₁₂ in the urine when it is given with IF.What is the correct interpretation?

Question

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The Schilling test is used to determine if the reason for low vitamin B₁₂ is an inability to absorb because of lack of IF or if the problem in absorption is related to something else.Because IF apparently corrected the problem in absorption,PA is the diagnosis.If some other malabsorption problem existed,the addition of IF would not have corrected the problem and the labeled vitamin B₁₂ would not have appeared in the urine.

A Patient Has a Decreased Vitamin B₁₂ Assay