A 38-year-old female presents to the clinic with a 3-month history of intermittent abdominal pain, bloating, and alternating constipation and diarrhea. The pain is often relieved by defecation. She denies fever, weight loss, or blood in her stool. Physical examination is normal. Based on the Rome IV criteria, which of the following is essential for the diagnosis of Irritable Bowel Syndrome (IBS)?
- AStool studies for infection and inflammation
- BColonoscopy with biopsies
- CPositive C-reactive protein (CRP) and erythrocyte sedimentation rate (ESR)
- DAbdominal pain related to defecation or change in stool frequency/form
Show answer & explanationAnswer & explanation
Correct answer: D. Abdominal pain related to defecation or change in stool frequency/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, associated with a change in frequency of stool, or associated with a change in form (appearance) of stool. The absence of alarm symptoms (fever, weight loss, blood in stool) and normal physical exam supports a functional diagnosis.
Why the other options are wrong
- A. Stool studies are used to rule out infectious or inflammatory causes, which is important, but the core diagnostic criterion for IBS is the symptom pattern.
- B. Colonoscopy with biopsies is typically performed to rule out inflammatory bowel disease or other structural issues, not for initial IBS diagnosis if alarm symptoms are absent.
- C. Elevated CRP and ESR are markers of inflammation and would suggest an inflammatory bowel disease, which is not characteristic of IBS.
Irritable Bowel Syndrome (IBS) Diagnosis
Diagnosis of a functional gastrointestinal disorder characterized by chronic abdominal pain and altered bowel habits without identifiable structural or biochemical cause.
- Diagnosed by Rome IV criteria.
- Key features: recurrent abdominal pain related to defecation or change in stool frequency/form.
- Diagnosis of exclusion after ruling out alarm symptoms.
Memory trick: IBS: 'I'f 'B'owel 'S'ymptoms are 'R'elated to 'D'efecation.