Can a Gut Microbiome Test Explain Why You’re Bloated?

By Dr Rowan Kearns

Short answer: Not by itself. A gut microbiome test can describe microorganisms and microbial functions detected in a stool sample. It cannot prove that a particular microbe is causing your bloating, diagnose IBS or rule out other causes such as constipation, food intolerance or coeliac disease.

Sources checked: 26 September 2026.

Key takeaways

  • A microbiome result is information about a stool sample—not a diagnosis of why you feel bloated.
  • Current expert consensus says evidence for routine clinical microbiome testing remains limited.
  • There is not yet a single agreed “healthy microbiome” reference range or validated general dysbiosis score.
  • Persistent, frequent or concerning bloating should be assessed medically, whether or not you have taken a microbiome test.

What can a gut microbiome test show?

What a test can report depends on its laboratory method. ARK’s current Advanced Gut Microbiome Test product specification says it uses shotgun metagenomic DNA sequencing to describe microorganisms and microbial functions detected within the submitted stool sample. Its pathway includes a report and a results consultation.

Evidence type: this is a factual description of ARK’s current service, not evidence that the test can diagnose bloating or improve symptoms.

An international expert consensus on microbiome testing describes microbiome analysis as a complex process involving sample collection, sequencing, computational analysis and interpretation. The panel concluded that evidence supporting routine clinical use remains limited.

Can the result identify the cause of bloating?

No. The NHS lists several possible contributors to bloating, including gas, some foods and drinks, swallowing air, constipation, food intolerance, coeliac disease and IBS. A microbiome profile does not by itself distinguish among these causes.

The NHS also states that there is no single test for IBS. A GP usually considers the pattern and duration of symptoms and may arrange blood or stool tests to rule out other causes.

Evidence type: NHS expert guidance. The conclusion that a microbiome profile cannot establish the cause alone follows from those diagnostic limitations and the international microbiome-testing consensus.

How should you interpret a microbiome report?

Microbiome information versus diagnosis
Question What a report may contribute What it cannot establish alone
Which microbes were detected? A profile of microbial DNA found in the submitted stool sample, within the limits of the method. That a detected organism caused your bloating.
How does the sample compare? Comparison with the provider’s stated reference data and reporting framework. A universal verdict that your microbiome is “healthy” or “unhealthy”.
What functions are suggested? Depending on the method, the genetic potential for particular microbial functions. Proof that those functions were active in your gut or responsible for symptoms.
What should happen next? Questions to discuss alongside symptoms, medicines, diet and bowel habits. A replacement for a GP assessment or validated diagnostic testing.

Evidence type: the limitations reflect the 2025 international consensus and a 2026 British Society of Gastroenterology expert-panel review. The “questions to discuss” wording is a cautious editorial interpretation, not a proven clinical benefit.

Is there a normal or ideal microbiome score?

Not one that can currently be applied universally. The international consensus found insufficient information for strict healthy reference ranges for the relative abundance of individual species and insufficient evidence for including a general dysbiosis index in microbiome reports.

That does not make every measurement meaningless. It means the result should be presented with its method, reference data and limitations rather than converted into a simple diagnosis or a guaranteed food-and-supplement plan.

When might testing still be useful?

Someone may choose testing for a more detailed, exploratory description of a stool sample or to structure a conversation about diet, symptoms, medicines and routine. That is a personal-information use, not an established diagnosis or treatment pathway.

If you choose a test, ask what sequencing method is used, what the comparison population is, how limitations are explained and whether a suitably qualified person will help you interpret the report without treating associations as causes.

Evidence type: the need for transparent methods and limitations comes from expert consensus. The suggested questions are ARK editorial guidance.

Should I see a GP before ordering a test?

See a GP if you feel bloated regularly, the bloating does not go away, or dietary changes have not helped. Unintentional weight loss or blood in your stool also needs assessment.

Seek urgent medical advice for bloating with vomiting, diarrhoea or constipation, tummy pain, fever, a lump or swelling, or an inability to pass urine, stool or wind. Call 999 or go to A&E for a swollen tummy with sudden severe pain, vomiting blood or severe breathing difficulty.

A commercial microbiome test should never delay appropriate medical care or replace tests recommended by your clinician.

Explore ARK’s related guidance

The product link explains the current service and laboratory method. It is not a claim that microbiome testing diagnoses or treats bloating, IBS, food intolerance or any other condition.

Sources and evidence notes

Sources checked: 26 September 2026. No product efficacy, diagnosis, treatment or guaranteed personalised-result claim is made.

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