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Irritable Bowel Syndrome Diagnosis (Rome III criteria)

Recurrent abdominal pain or discomfort (uncomfortable sensation not described as pain) at least 3 days/month in the last 3 months with symptom onset at least 6 months prior to diagnosis?
No   
Yes

Is there improvement  with defecation?
No   
Yes

Is the onset associated with a change in frequency of stool?
No   
Yes

Is the onset associated with a change in form (appearance) of stool?
No   
Yes

References

Rome III Diagnostic Criteria for Functional Gastrointestinal Disorders. Appendix A. Accessed: July 2017. Guidelines.  

 [In pathophysiology research and clinical trials, a pain/discomfort frequency of at least 2 days a week during screening evaluation is recommended for subject eligibility. ]

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