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Breath test probes hidden link between bloating and gut bacteria

NCT ID NCT06285734

Diagnosis Sponsor: Shandong University Source: ClinicalTrials.gov ↗

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Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed This study
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
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Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Sep 17, 2026 · Last updated Sep 18, 2026 · Updated 1 time

Summary

Researchers are studying whether small intestinal bacterial overgrowth (SIBO) is common in people with abdominal bloating or distension. Adults aged 18 to 70 with these symptoms take a breath test that measures hydrogen and methane in their exhaled air. The study aims to see how often SIBO appears and whether specific symptoms or patient characteristics relate to it.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
breath test for hydrogen and methane
What this could lead to
If the breath test reliably identifies SIBO in people with bloating, doctors could use it to diagnose the condition and guide treatment.
What could go wrong
The breath test may not accurately reflect bacterial overgrowth, and the study may not prove that SIBO causes bloating. The findings may not apply to everyone with bloating.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Participants

387 people

The number who actually took part.

Started

Mar 2024

Finished

Jun 2026

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Who is studied

Abdominal bloating/distension patients in the outpatient department.

Ages

18 to 70 years

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: 1. Patients aged 18 to 70 years. 2. Patients presenting with the primary complaint of abdominal bloating and/or abdominal distension, or those exhibiting abdominal distension with prominence over other symptoms. Exclusion Criteria: 1. Patients who are pregnant or lactating. 2. Patients have history of gastrointestinal malignancy or gastrointestinal surgery. 3. Patients manifesting food intolerance or presenting with a confirmed diagnosis or suspicion of lactose intolerance. 4. Patients with urinary system (chronic kidney disease, etc.), immune system (scleroderma, etc.), nervous system (Parkinson's disease, etc.), mental system (depression, etc.), or other diseases outside the digestive system. 5. Patients who used antibiotics or microecological agents or underwent endoscopic examination within two weeks. 6. Patients with a medication history encompassing motility enhancers, secretory enhancers, antifoaming agents, spasmolytics, opioids, and antidepressants within the past week. 7. Patients who are unwilling or incapable to provide informed consents.

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Conditions

The condition(s) this trial relates to.

small intestinal bacterial overgrowth

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Abdominal bloating Abdominal distention

Contacts and locations

Locations

  • Gastroenterology Department of Qilu Hospital

    Jinan, Shandong, 250012, China

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