Rome II criteria are used for

Rome II criteria for the diagnosis of Irritable Bowel SyndromeRecurrent abdominal pain or discomfo at least 3 days per month in the last 3 months associated with two or more of the following:Improvement with defecationOnset associated with a change in frequency of stoolOnset associated with a change in form (appearance) of stoolRef: Harrison 19e pg: 1965