Dual isotope Schilling test for measuring absorption of food-bound and free vitamin B12 simultaneously.

Abstract:

:A prototype food-bound vitamin B12 (food-B12) absorption test has been developed in which 57Co-B12 was incorporated in vitro into egg yolk (yolk-B12) and served to volunteers in 50-g cooked portions together with toast and coffee for breakfast. Six hours later, 1 mg nonlabeled B12 was given intramuscularly and 24-hour urine was collected for radioactivity measurement. In separate tests, the absorption of yolk-B12 and crystalline 57Co-B12 was equally poor in patients with pernicious anemia. However, in patients with simple gastric achlorhydria and those who had undergone gastric surgery, the assimilation of yolk-B12 was impaired greatly, whereas the absorption of crystalline radio-B12 was normal. Egg yolk labeled with 58Co-B12 was administered together with crystalline 57Co-B12 in a dual isotope test with results similar to those obtained when the tests were prepared separately. This yolk-58Co-B12 test with its ability to detect malabsorption of food-B12 may be considered as an addition to the first part of the Schilling test.

journal_name

Am J Clin Pathol

authors

Doscherholmen A,Silvis S,McMahon J

doi

10.1093/ajcp/80.4.490

subject

Has Abstract

pub_date

1983-10-01 00:00:00

pages

490-5

issue

4

eissn

0002-9173

issn

1943-7722

journal_volume

80

pub_type

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