[The influence of vitamin B 12 premedication on the result of the Schilling test (author's transl)].

The effect of previous administration of vitamin B 12 on the Schilling test was examined in 10 patients, repeating the test during and 10 days after vitamin B 12 treatment. Under vitamin B 12 medication, the patients showed a significantly decreased vitamin B 12 urinary excretion. Ten days after vitamin B 12, repeat Schilling test demonstrated comparable results with baseline values except for one patient, who persistently had a low value.