Real-world Study of Three-gas Breath Testing Nationwide and the Association With Symptoms.
Mark Pimentel, Gabriela Leite, LiJin Joo, Ali Rezaie, Ruchi Mathur, Darren Brenner, Linda Nguyen, Mohamad Rashid, Ava Hosseini, Daniel Brimberry, Matthew Mitcho, David Richardson, Fabrice Wilfong
Journal of clinical gastroenterology
41671534
February 2, 2026
Quality Indicators
Industry Funded: This study was funded by a pharmaceutical or biotech company. Results may reflect potential bias. Exercise additional caution when interpreting findings.
Abstract Only: Full text of this study is not publicly available. This summary is based on the abstract only and may be less detailed than usual.
AI-Generated Summary: This summary was created by AI and may contain errors. Always consult healthcare professionals and read the original study for medical decisions.
Study Summary
AI-generated overview of this research
Quick Summary
This nationwide study of 3,004 people tested three gases in breath tests—hydrogen, methane, and hydrogen sulfide—to see how they relate to digestive symptoms. Hydrogen sulfide levels were strongly linked to diarrhea and more severe symptoms overall, while methane correlated with constipation and hydrogen with diarrhea.
What Was Studied
Researchers examined 6,000 consecutive patients nationwide who completed at-home three-gas breath tests, comparing their hydrogen, methane, and hydrogen sulfide levels to digestive symptoms they reported on questionnaires. The study analyzed whether different gas patterns matched specific symptoms like bloating, diarrhea, constipation, and abdominal pain.
How the Study Was Conducted
Patients performed breath tests at home using either glucose or lactulose substrate (chosen by their physician), then completed symptom questionnaires rating severity of bloating, diarrhea, constipation, and pain. Researchers used machine learning analysis to identify patterns between gas levels and symptoms. Full methodology not publicly available—summary based on abstract only.
Key Findings
- Hydrogen sulfide (H2S) levels strongly correlated with diarrhea severity (P<0.0001), urgency (P=0.003), and abdominal pain (P=0.01), with patients having intestinal sulfide overproduction (ISO, defined as ≥2 ppm H2S) reporting the highest overall symptom severity
- Methane (CH4) levels correlated with constipation (P=0.002), while hydrogen (H2) levels correlated with diarrhea severity (P=0.031), confirming each gas associates with distinct symptom patterns
- Lactulose substrate detected SIBO positivity in 27% of patients compared to only 7.3% with glucose, suggesting glucose testing may miss symptomatic patients
- Bloating was the most common reason for testing, with 52.9% of patients reporting severe or very severe bloating compared to only 17.8% for diarrhea, 17.1% for constipation, and 17.1% for abdominal pain
Important Limitations
- Study received pharmaceutical/industry funding, which may introduce bias in study design, interpretation, or reporting of results
- Substrate choice (glucose vs. lactulose) was at physician's discretion rather than randomized, potentially introducing selection bias in comparisons between the two methods
- Full text not publicly available—summary based on abstract only
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