1. Nat. Rev. Gastroenterol. Hepatol. doi:10.1038/nrgastro.2018.7
Figure 5 Lactulose H2 breath test for measurement of orocaecal transit time
Figure 5| Lactulose H2 breath test for measurement of orocaecal transit time. Representative lactulose H2 breath tests (LHBTs) are shown for accelerated (30 min), normal (75 min) and delayed (225 min) orocaecal transit times (OCTTs). The test requires H2 measurements at regular intervals after ingestion of lactulose. H2 values of >10 ppm over basal values followed by at least two subsequent increments (arrows) indicate caecal delivery of the nonabsorbable substrate with subsequent bacterial metabolism. This increase in H2 exhalation normally occurs 50–200 min after ingestion of the marker substance (normal range for OCTT marked in grey).
Keller, J. et al. (2018) Advances in the diagnosis and classification of gastric and intestinal motility disorders
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