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the claim
The hydrogen breath test accurately diagnoses lactose intolerance.
the verdict
SUPPORTED
the evidence backs this
refutedsupported
the weight of evidence
6 sources for · 0 against

The hydrogen breath test is widely recognized and used in clinical practice as an objective diagnostic tool for lactose intolerance, though some patients fail to produce hydrogen and may require alternative or combined assessments.

Evidence for · 6
Hydrogen and Methane Breath Test in the Diagnosis of Lactose Intolerance
2021 · cited by 26
Evaluates the hydrogen breath test as a non-invasive investigation to diagnose lactose intolerance, noting limitations.
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The analysis

Judged against the evidence record for claims of this kind.

More for · 5
Lactose intolerance and probiotics: from pathophysiological mechanisms to clinical applications.
2026 · cited by 2
States objective assessment is achieved via a specific breath test measuring hydrogen, requiring concurrent symptoms.
Added Value of <sup>13</sup>C Analysis in Breath Tests in H<sub>2</sub>-Negative Subjects to Diagnose Lactose Malabsorption: A Proof of Concept Study.
2024 · cited by 2
Notes diagnosing relies on hydrogen excretion, though some malabsorbers do not present a hydrogen rise.
Breath Hydrogen Test in Lactose Malabsorption
2018 · cited by 2
States the breath hydrogen test is sensitive, specific, and used to diagnose lactose malabsorption/intolerance.
Wikipedia: Hydrogen breath test
cited by 0
Reference article covering this claim directly
Omnigraphics, Inc.: Gastrointestinal diseases and disorders sourcebook
1996 · cited by 0
Notes that the hydrogen breath test measures and confirms lactose intolerance.
Everything we examined (12) — 9 independent sources
This check searched the claim as stated. It did not run a separate search for evidence against it.
  1. Wikipedia: Hydrogen breath testreferencesame source L1supports
  2. Wikipedia: Lactose intolerancereferencesame source L1no side takennot shown: read and judged not to bear on this claim
  3. Omnigraphics, Inc.: Gastrointestinal diseases and disorders sourcebookreferencesupports
  4. Blackwell Pub.: Textbook of gastroenterologyreferenceno side takennot shown: read and judged not to bear on this claim
  5. W.B. Saunders: Kirk's current veterinary therapy. XIII, Small animal practicereferenceno side takennot shown: read and judged not to bear on this claim
  6. Lippincott Williams & Wilkins: Irwin and Rippe's intensive care medicinereferenceno side takennot shown: read and judged not to bear on this claim
  7. Hydrogen and Methane Breath Test in the Diagnosis of Lactose Intolerancepeer-reviewedsame source L6supports
  8. Hydrogen and Methane Breath Test in the Diagnosis of Lactose Intolerancepeer-reviewedsame source L6supports
  9. Lactose intolerance and probiotics: from pathophysiological mechanisms to clinical applications.peer-reviewedsupports
  10. Added Value of <sup>13</sup>C Analysis in Breath Tests in H<sub>2</sub>-Negative Subjects to Diagnose Lactose Malabsorption: A Proof of Concept Study.peer-reviewedsame source L8supports
  11. Added Value of <sup>13</sup>C Analysis in Breath Tests in H<sub>2</sub>-Negative Subjects to Diagnose Lactose Malabsorption: A Proof of Concept Study.peer-reviewedsame source L8supports
  12. Breath Hydrogen Test in Lactose Malabsorptionpeer-reviewedsupports
The paper trail · every fact has a biography
first checked05 Aug 2026
judged → SUPPORTED · 8405 Aug 2026
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