E. J. Watson-Williams, M.R.C.P.
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Recurrent or chronic symptomless gastrointestinal bleeding without radiographic abnormality is a not infrequent clinical problem. Investigation of 20 patients by the measurement of fecal radioactivity, after an intravenous injection of autologous red cells labeled with 200 µc 51Cr, showed that maximum levels were reached within 24 hr in 4 cases of colonic bleeding, between 24 and 48 hr in 3 cases of cecal bleeding, between 48 and 72 hr in 4 cases of bleeding from the small intestine, and after 96 hr in 9 patients bleeding from the duodenum or stomach. Provided blood loss was chronic these timings were not
Watson-Williams EJ. Radioactive Chromium in the Investigation of Gastrointestinal Bleeding.. Ann Intern Med. 1968;68:1150. doi: https://doi.org/10.7326/0003-4819-68-5-1150_2
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Published: Ann Intern Med. 1968;68(5):1150.
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