Rome III Diagnostic Criteria * (esp. for research purposes):
Recurrent abdominal pain / discomfort for at least 3 days per month, over the last 3 months, associated with 2 or more of the following:
- Improvement with defecation
- Onset associated with change in frequency of stool
- Onset associated with change in form (appearance) of stool
* Criteria must have been fulfilled for the last 3 months, but Symptom Onset required at least 6 months prior to diagnosis
Other criteria for IBS when chief complaint is diarrhea (Manning Criteria).
See postings Chronic Abdominal Pain and Chronic Diarrhea.