What are the Rome IV criteria for IBS?

Recurrent abdominal pain on average at least 1 day a week in the last 3 months, linked to two or more of: a bowel movement, a change in stool frequency, and a change in stool form. Symptoms must have started at least 6 months before diagnosis.

Can I diagnose myself with IBS using the Rome IV criteria?

No. Matching the pattern tells you your symptoms look like IBS, but coeliac disease, inflammatory bowel disease and other conditions can look the same. A clinician checks for alarm features and usually orders a few blood tests, and sometimes a stool test, first.

What tests confirm IBS?

No single test confirms IBS. NICE recommends a full blood count, ESR or plasma viscosity, CRP and coeliac antibodies to rule out other conditions, and a faecal calprotectin stool test is often added when diarrhoea is present.

Do I need a colonoscopy to diagnose IBS?

Usually not. NICE lists colonoscopy as not necessary to confirm IBS in someone who meets the diagnostic criteria. It is used when there are alarm features or something else needs ruling out.

What is the difference between Rome III and Rome IV for IBS?

Rome IV dropped abdominal discomfort, raised the pain threshold from 3 days a month to 1 day a week, and changed pain relieved by defaecation to pain related to defaecation. It is a stricter definition than Rome III.

Does bloating count towards the Rome IV criteria?

No. Bloating is not required for Rome IV, although the British Society of Gastroenterology notes that, when present, it is highly suggestive of IBS.

Rome IV IBS Criteria Checker

See whether your symptoms fit the Rome IV pattern for IBS.

Free
About 2 minutes
No account
Updated October 3, 2026

The short answer

Under Rome IV, IBS means recurrent abdominal pain on at least 1 day a week, on average, over the last 3 months, linked to two or more of: having a bowel movement, a change in how often you go, and a change in what your stool looks like. Symptoms must have started at least 6 months ago. Matching this pattern is not a diagnosis: a clinician also checks for alarm features and usually runs a few blood tests.

How to use the Rome IV IBS Criteria Checker

1Say how often you have had tummy pain over the last 3 months.
2Tick which of the three Rome IV features your pain is linked to, and when your symptoms started.
3Tick any alarm features that apply. If you tick one, the result leads with seeing a doctor.
4See whether your answers match, partly match or do not match the Rome IV pattern, and what a clinician checks next.

The Rome IV criteria for IBS

Rome IV was published by the Rome Foundation in 2016 and is the version gastroenterologists and researchers use worldwide. Both parts must be met.

Part	What Rome IV requires
1	Recurrent abdominal pain, on average at least 1 day per week in the last 3 months
1a	Related to defaecation (having a bowel movement)
1b	Associated with a change in frequency of stool
1c	Associated with a change in stool form
	Pain must be linked to two or more of 1a, 1b and 1c
2	Criteria fulfilled for the last 3 months, with symptom onset at least 6 months before diagnosis

What changed from Rome III

Rome IV removed abdominal "discomfort", because the word was vague and did not translate consistently between languages. It raised the pain threshold from at least 3 days a month to at least 1 day a week. And pain no longer has to be relieved by a bowel movement: it only has to be related to one, since some people find their pain gets worse after going.

The result is a stricter definition. The British Society of Gastroenterology says Rome IV is probably overly restrictive for everyday care, and that NICE's broader definition, abdominal pain or discomfort with altered bowel habit for at least 6 months and no alarm features, may suit primary care better.

Why matching the pattern is not a diagnosis

Coeliac disease, inflammatory bowel disease, bile acid diarrhoea, microscopic colitis and other conditions can produce the same symptoms. So a clinician also checks for alarm features and usually orders a short set of tests.

NICE recommends a full blood count, ESR or plasma viscosity, CRP and antibody testing for coeliac disease in people who meet the IBS criteria. The British Society of Gastroenterology adds faecal calprotectin for people under 45 with diarrhoea, to look for inflammatory bowel disease. NICE also lists tests that are not needed to confirm IBS, including colonoscopy, ultrasound and thyroid tests.

Test	What it looks for
Full blood count	Anaemia, which is not part of IBS
CRP and ESR (or plasma viscosity)	Inflammation in the body
Coeliac antibodies (tTG or EMA)	Coeliac disease, while you are still eating gluten
Faecal calprotectin, if diarrhoea	Inflammation in the bowel, such as Crohn's or colitis

Alarm features come first

Blood in your stool, weight loss you cannot explain, symptoms that wake you at night, anaemia, a lump in your tummy or back passage, or symptoms starting for the first time at 50 or over all sit outside a typical IBS picture. If any apply, see a doctor before thinking about labels. The gut red flags checker explains how soon.

Frequently asked questions

What are the Rome IV criteria for IBS?: Recurrent abdominal pain on average at least 1 day a week in the last 3 months, linked to two or more of: a bowel movement, a change in stool frequency, and a change in stool form. Symptoms must have started at least 6 months before diagnosis.
Can I diagnose myself with IBS using the Rome IV criteria?: No. Matching the pattern tells you your symptoms look like IBS, but coeliac disease, inflammatory bowel disease and other conditions can look the same. A clinician checks for alarm features and usually orders a few blood tests, and sometimes a stool test, first.
What tests confirm IBS?: No single test confirms IBS. NICE recommends a full blood count, ESR or plasma viscosity, CRP and coeliac antibodies to rule out other conditions, and a faecal calprotectin stool test is often added when diarrhoea is present.
Do I need a colonoscopy to diagnose IBS?: Usually not. NICE lists colonoscopy as not necessary to confirm IBS in someone who meets the diagnostic criteria. It is used when there are alarm features or something else needs ruling out.
What is the difference between Rome III and Rome IV for IBS?: Rome IV dropped abdominal discomfort, raised the pain threshold from 3 days a month to 1 day a week, and changed pain relieved by defaecation to pain related to defaecation. It is a stricter definition than Rome III.
Can you have IBS without meeting the Rome IV criteria?: Many people are diagnosed without meeting them strictly. The British Society of Gastroenterology says Rome IV is probably overly restrictive for everyday care, and NICE uses a broader definition in primary care.
Does bloating count towards the Rome IV criteria?: No. Bloating is not required for Rome IV, although the British Society of Gastroenterology notes that, when present, it is highly suggestive of IBS.

Should I See a Gastroenterologist for IBS?
Most IBS is managed well in primary care. Here is what a GP can order and prescribe, the guideline-backed reasons to refer, and what a specialist actually adds.
How to Explain IBS to Your Doctor in 60 Seconds
IBS is diagnosed from what you say, not from a test. The exact words that get you a positive diagnosis, the right tests, and a doctor who keeps listening.
Difference Between IBS-D and IBS-C Explained
IBS-D and IBS-C are separated by one rule: what share of your abnormal stools are loose versus hard. Here is how the rule works and why the label keeps moving.
Questions to Ask a Gastroenterologist About IBS
The questions that change what happens in an IBS appointment: how the diagnosis was made, which tests are and are not indicated, and what gets tried first.
SIBO vs IBS Symptoms: Can You Tell Them Apart?
Not from symptoms alone. Bloating, gas and loose stools look identical in both. What the breath test can and cannot settle, and what is worth ruling out first.

Sources

Mearin F, Lacy BE, Chang L, Chey WD, Lembo AJ, Simren M, et al. Bowel disorders. Gastroenterology. 2016;150(6):1393-407.e5. doi:10.1053/j.gastro.2016.02.031
Vasant DH, Paine PA, Black CJ, Houghton LA, Everitt HA, Corsetti M, et al. British Society of Gastroenterology guidelines on the management of irritable bowel syndrome. Gut. 2021;70(7):1214-40. doi:10.1136/gutjnl-2021-324598
Schmulson MJ, Drossman DA. What is new in Rome IV. J Neurogastroenterol Motil. 2017;23(2):151-63. doi:10.5056/jnm16214
National Institute for Health and Care Excellence. Irritable bowel syndrome in adults: diagnosis and management. Clinical guideline CG61. London: NICE; 2008, updated 2017. https://www.nice.org.uk/guidance/cg61
National Institute for Health and Care Excellence. Faecal calprotectin diagnostic tests for inflammatory diseases of the bowel. HealthTech guidance HTG320 (formerly DG11). London: NICE; 2013. https://www.nice.org.uk/guidance/htg320
Lacy BE, Pimentel M, Brenner DM, Chey WD, Keefer LA, Long MD, et al. ACG clinical guideline: management of irritable bowel syndrome. Am J Gastroenterol. 2021;116(1):17-44. doi:10.14309/ajg.0000000000001036
Menees SB, Powell C, Kurlander J, Goel A, Chey WD. A meta-analysis of the utility of C-reactive protein, erythrocyte sedimentation rate, fecal calprotectin, and fecal lactoferrin to exclude inflammatory bowel disease in adults with IBS. Am J Gastroenterol. 2015;110(3):444-54. doi:10.1038/ajg.2015.6
Hammer J, Eslick GD, Howell SC, Altiparmak E, Talley NJ. Diagnostic yield of alarm features in irritable bowel syndrome and functional dyspepsia. Gut. 2004;53(5):666-72. doi:10.1136/gut.2003.021857

Cite this tool

Clairop. Rome IV IBS Criteria Checker. www.clairop.com/tools/rome-iv-ibs-criteria-checker. Updated October 3, 2026.

Clairop is a general wellness app for people living with a diagnosed digestive condition. It does not replace professional medical care, diagnosis, or treatment. Always follow your healthcare provider's advice.

Clairop logs meals, symptoms and stool in seconds, then looks for the foods your gut reacts to, including reactions that land days later.

More free tools

All free tools