Functional diarrhea can be diagnosed using the Rome IV criteria.
Diagnostic criteria for functional diarrhea - all of the following:
(1) loose or watery stools occurring in > 25% of stools
(2) abdominal pain or abdominal bloating absent or not predominant symptoms (minor)
(3) onset >= 6 months before diagnosis
(4) symptoms present for the last 3 months
(5) exclusion of other explanations for diarrhea including diarrhea-predominant irritable bowel syndrome (IBS)
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Specialty: Gastroenterology
