Vitamin B12 absorption deficiency following bypass of the ileum

Henry Buchwald

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


Vitamin B12 absorption, as determined by the urinary-excretion test o Schilling, is reported in 6 patients who have undergone distal ileal bypas surgery. The operation was performed to lower circulating cholestero levels in patients with hypercholesteremia and arteriosclerosis. The bowel in each case was normal. The Schilling-test results were all significantly below the accepted normal limit; they ranged from 4.7 to below 1%. These clinical findings support the data indicating that the ileum is the primary site of vitamin B12 absorption.

Original languageEnglish (US)
Pages (from-to)755-759
Number of pages5
JournalThe American Journal of Digestive Diseases
Issue number11
StatePublished - Nov 1 1964


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