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Hydrogen Breath Test

Explore our guide on Hydrogen Breath Tests, a crucial tool for diagnosing digestive disorders like lactose intolerance and bacterial overgrowth.

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By Nate Lacson on Aug 2, 2025.

Fact Checked by Ericka Pingol.

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Commonly asked questions

A hydrogen breath test primarily diagnoses conditions related to carbohydrate malabsorption, such as lactose intolerance, bacterial overgrowth in the small intestine, and fructose malabsorption.

To prepare for a hydrogen breath test, you should fast for at least 12 hours, avoid certain foods and medications as instructed, and refrain from smoking to ensure accurate results.

Yes, you can drink water before a hydrogen breath test, but it should be in moderation, and avoid any flavored or sweetened water.

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