Urinary Excretion of Radiovitamin B12in Carriers ofDiphyllobothrium latum

Abstract
USING the fecal-excretion test, Nyberg1 found that nonanemic carriers of the fish tapeworm, Diphyllobothrium latum, absorb on the average 55 per cent less radiovitamin B12 than normal subjects. Though the fecal-excretion test appears to be at present the most accurate method for the assay of radiovitamin B12 absorption, it cannot be considered an ideal method for routine purposes and for the study of a large number of subjects. Therefore, we have considered it desirable to check the earlier results by performing an absorption study using Schilling's urinary radioactivity test.2 Since this test is commonly used in the . . .