Nutrition
Hydrogen Breath Test for SIBO
Hydrogen breath test for SIBO tracks exhaled hydrogen after a substrate drink—prep and methane co-testing shape whether overgrowth is likely.
A hydrogen breath test for SIBO measures exhaled hydrogen after a lactulose or glucose drink—rising early suggests bacterial fermentation in the small intestine. Prep matters: antibiotics, laxatives, and fermentable meals before the test skew results.
A flat hydrogen curve with high methane may point to methane-dominant organisms instead. Athletes should not train hard the morning of testing if clinics advise rest.
Common questions
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Can a normal hydrogen test still mean gut symptoms?
Yes—IBS, rapid eating, and FODMAP intolerance can hurt without SIBO. Treat the full picture, not one breath curve in isolation.
Related terms
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