Rome IV Matrix • IBS Diagnostic Tool
Pain ≥ 1 day/week for 3 months?
Associated with (Select all that apply)
Related to defecation
Change in frequency of stool
Change in form/appearance of stool
Select the presence of pain and associated symptoms to visualize the Rome IV diagnostic profile.
Guidelines & Evidence
Verified
Last Review: 2026-07-17
When to Use
When to Use
Diagnosis of Disorders of Gut-Brain Interaction (DGBI), formerly called Functional GI Disorders
Applying standardized criteria for IBS, Functional Dyspepsia, and Functional Constipation
Used to minimize unnecessary invasive testing once "Red Flags" are excluded
The 'Red Flag' Rule
Rome IV criteria should only be applied after excluding "Alarm Features" (Red Flags) like weight loss, nocturnal symptoms, anaemia, or blood in the stool, which mandate organic workup (e.g., Colonoscopy).
How it Works
Universal Time Requirement
Core DGBI Definitions
01
IBS: Recurrent abdominal pain (at least 1 day/week) related to defecation or change in stool frequency/form.
02
Functional Dyspepsia: Epigastric pain or burning, early satiety, or post-prandial fullness, with no organic cause.
03
Functional Constipation: Difficult, infrequent, or incomplete defecation that does not meet IBS criteria.
Symptom Associations
| Pain + Defecation | IBS |
| Pain (No defecation link) | Functional Dyspepsia or Centrally Mediated Pain |
| Bloating (Isolated) | Functional Abdominal Bloating/Distension |
Clinical Pearls
Rome IV vs. Rome III
Rome IV (2016) removed the term "discomfort" from the IBS definition, focusing strictly on "pain." It also increased the frequency threshold from 3 days/month to 1 day/week. This change has made the IBS diagnosis more specific, often identifying a "sicker" population than Rome III.
Gut-Brain Axis
The transition from "Functional" to "Gut-Brain Interaction" acknowledges that symptoms are not "in the patient's head" but are the result of visceral hypersensitivity and abnormal communications between the ENS and CNS.
Clinical Pearls
In patients < 45-50 years old with no alarm features, the "Positive Diagnostic Strategy" (applying Rome criteria) is both safe and cost-effective
Functional Constipation allows for "hard stools" but requires the absence of abdominal pain related to the stooling
Over 70% of IBS patients also meet criteria for Functional Dyspepsia (Overlap Syndrome)
Next Steps
Management Priority
01
IBS confirmed: Subtype by Bristol Stool Scale (IBS-C, D, or M); Start Low-FODMAP trial or Secretagogues.
02
Functional Dyspepsia: Check H. pylori status; trial of PPI or Prokinetics.
The Evidence
The Global Standard
Rome IV-Functional GI Disorders: Disorders of Gut-Brain Interaction.
Drossman DA et al. • Gastroenterology. 2016;150(6):1257-1261. The defining consensus report.
View Source• . ;
Origins & History
The Rome Foundation
Beginning in 1989, a group of international experts has met every 6–10 years in Rome to standardize these criteria. Led by Douglas Drossman, the foundation has successfully moved DGBIs from "diagnoses of exclusion" to "positive clinical diagnoses."
Last Comprehensive Review: 2026-07-17