Irritable Bowel Syndrome (IBS) & Diarrhea

Manning Criteria for IBS — 2 or more of the following 6 parameters:
  • Pain relieved with defecation
  • ↑ Stool frequency at time of pain
  • Diarrheal stools at time of pain
  • Mucus in stool
  • Sensation of incomplete defecation
  • Abdominal distention on PE
Accuracy for IBS depends on sex, age, & number of criteria.  For example:
  • 20 y.o. women: 2/6 (50%) to 6/6 (>90%)
  • 60 y.o. man:  2/6 (25%) to 6/6 (70%)
Accuracy for men is always less than for women, and accuracy for everyone decreases after 40 y.o.
  • Don’t Dx new-onset IBS in pt. ≥50 y.o. without a decent work-up (incl. colonoscopy)

See also “IBS & Abdominal Pain

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