Assessing Diagnostic Performance of Modifications to the Rome IV Criteria for Irritable Bowel Syndrome.

The gold standard symptom-based criteria for diagnosis of irritable bowel syndrome (IBS) are the Rome IV criteria. These are more restrictive than their predecessor, Rome III, because the cardinal feature required to meet criteria for IBS was changed to presence of abdominal pain alone, rather than abdominal pain or discomfort. This change was made because discomfort was believed to be an ambiguous term, with no equivalent in some languages. In addition, symptom frequency required for the presence of abdominal pain was increased to 1 day per week from 2 to 3 days per month. This has led to reduced sensitivity for detecting IBS and a 50% decrease in the prevalence of the disorder in the community. In a cross-sectional survey applying both Rome IV and III criteria to people living with IBS, 89% of those with Rome III-defined IBS not meeting Rome IV criteria did not meet Rome IV criteria because of this change in pain frequency. Previous iterations of the Rome criteria have performed only modestly in predicting a diagnosis of IBS. However, in a validation study, the Rome IV criteria outperformed Rome III, largely because their more restrictive nature made them more specific than Rome III. We assessed whether modifications to the Rome IV criteria led to a better trade-off between sensitivity and specificity.