A 45-year-old male presents with a 2-month history of intermittent abdominal pain, bloating, and alternating episodes of diarrhea and constipation. He reports that the pain is often relieved by defecation. He denies any weight loss, nocturnal symptoms, or blood in his stool. His physical exam is unremarkable. Based on the Rome IV criteria, which of the following is most consistent with Irritable Bowel Syndrome (IBS)?
- AAbdominal pain, bloating, and diarrhea, with symptom onset after age 50 and nocturnal symptoms.
- BIntermittent abdominal pain and constipation lasting for more than 1 month, with positive stool cultures.
- CRecurrent abdominal pain, on average at least 1 day per week in the last 3 months, associated with two or more of the following: related to defecation, change in stool frequency, change in stool form.
- DPresence of chronic abdominal pain and altered bowel habits for at least 6 months, regardless of relief with defecation.
Show answer & explanationAnswer & explanation
Correct answer: C. Recurrent abdominal pain, on average at least 1 day per week in the last 3 months, associated with two or more of the following: related to defecation, change in stool frequency, change in stool form.
The Rome IV criteria for IBS require recurrent abdominal pain, on average, at least 1 day per week in the last 3 months, associated with two or more of the following: related to defecation, change in stool frequency, or change in stool form. The patient's presentation aligns perfectly with these criteria, and the absence of alarm symptoms (weight loss, nocturnal symptoms, blood in stool) supports an IBS diagnosis.
Why the other options are wrong
- A. Symptom onset after age 50 and nocturnal symptoms are 'alarm symptoms' that would make IBS less likely and warrant further investigation.
- B. IBS is not diagnosed by positive stool cultures, and the duration is too short for the chronic nature of IBS according to Rome IV.
- D. This option is incomplete and inaccurate as it omits the specific frequency and association with defecation/stool changes.
IBS Rome IV Diagnostic Criteria
The Rome IV criteria define Irritable Bowel Syndrome (IBS) as recurrent abdominal pain, at least 1 day/week for 3 months, associated with defecation, stool frequency, or stool form changes.
- Recurrent abdominal pain: at least 1 day/week for 3 months.
- Associated with 2+ of: related to defecation, change in stool frequency, change in stool form.
- Criteria fulfilled for 3 months, with symptom onset at least 6 months prior to diagnosis.
- Absence of alarm symptoms (e.g., weight loss, GI bleeding, nocturnal symptoms).
Memory trick: Rome's Rule: Pain once a week, relieved by the poop, changes in form and frequency.