Reproducibility and simplification of 13C-octanoic acid breath test for gastric emptying of solids

The American Journal of Gastroenterology
M G ChoiK S Nair

Abstract

The accuracy of the 13C-octanoic acid breath test is enhanced by breath sampling over 6 h rather than 4 h, but this increases the cost of the test. Our aim was to validate a less costly but accurate sequence of breath sampling for measuring gastric emptying of solids. We performed the 13C-octanoic acid breath test and tested its reproducibility relative to simultaneous scintigraphy in 30 healthy volunteers. There was a significant but weak correlation between t1/2 measured by the two tests (rs = 0.54, p < 0.005), but not between the duration of the lag phase. The differences in the t1/2 measurements between the tests were different between subjects but were highly reproducible within subjects. Within- and between-subject variations of measurements of gastric emptying with the 13C-octanoic acid breath test were not significantly different from the variations observed with scintigraphy. A subset of 11 breath samples collected over 6 h (24 samples) predicted (r2 > 0.95) the variables characterizing the cumulative appearance of 13CO2 in breath; these samples were at 35, 50, 95, 110, 140, 155, 215, 245, 260, 290, and 335 min. The accuracy of this subset of sampling times was confirmed in a separate set of breath test samples over 6 ...Continue Reading

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