Irritable bowel syndrome classification

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief:

Overview

Irritable bowel syndrome (IBS) may be classified according to Rome IV criteria into four subtypes/groups: IBS with predominant constipation , IBS with predominant diarrhea, IBS with mixed bowel habits,and IBS unclassified. In addition, IBS occuring subsequent to GI infections is known as PI-IBS or post infectious IBS.

Classification

Irritable bowel syndrome (IBS) may be classified according to Rome IV criteria into 4 subtypes:

1. IBS with predominant constipation
2. IBS with predominant diarrhea
3. IBS with mixed bowel habits: alternating patterns of stool passage which is not in conjuncture with the normal bowel movements.
4. IBS unclassified: Patients who meet the diagnostic criteria for IBS but whose bowel habits do not fit into any of the above subtypes.
5. IBS-PI or post infectious IBS. It is an additional subtype described that occurs subsequent to infections of the GI tract.

SUBTYPE	HARD OR LUMPY STOOLS	LOOSE(MUSHY) OR WATERY STOOLS
IBS with constipation	≥ 25 percent	≤ 25 percent
IBS with diarrhea	≤ 25 percent	≥ 25 percent
Mixed IBS	≥ 25 percent	≥ 25 percent
Unsubtyped IBS	Insufficient abnormality of stool consistency to meet criteria for IBS with constipation, diarrhea, or mixed subtypes.