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Original Article

The Fate of Ingested 14C-Urea in the Urea Breath Test for Helicobacter pylori Infection

, , , , , , & show all
Pages 661-666 | Received 08 Oct 1992, Accepted 09 Feb 1993, Published online: 08 Jul 2009
 

Abstract

The metabolic fate of the radioactive carbon in the 14C-urea breath test for Helicobacter pylori was investigated in 18 subjects. After ingestion of labelled urea, breath was sampled for 24 h, and urine was collected for 3 days. Subjects were designated high or low expirers on the basis of their breath counts, and this agreed well with H. pylori serologic analyses. When given 185 or 37kBq of l4C-urea, 51% (SD = 16%, n = 11) of the label was recovered from the breath of high expirers, and 7% (SD = 3%, n = 7) from the breath of low expirers. The mean combined urinary and breath recovery for high expirers was 86% (SD = 7%), and for low expirers it was 97% (SD = 3%). It is concluded that the long-term retention of 14C from ingested l4C-urea is low. The results enable a more accurate estimation to be made of radiation exposure resulting from the l4C-urea breath test.

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