Table 2.

Findings Supportive of a Positive Diagnosis of IBS-C^2,10

Diagnostic criteria of IBS-C
Rome IV diagnostic criteria	Disorder of gut-brain interaction in which abdominal pain recurs on average at least 1 day/week PLUS ≥2 of the followinga: Related to defecation Associated with a change in the frequency of stool Associated with a change in the form (appearance) of stool
BSFS	BSFS type 1 or 2: >25% of bowel movements BSFS type 6 or 7: <25% of bowel movements
Hallmark symptoms	Abdominal pain Constipation
Medical history and physical examination	Additional targeted history to exclude: New symptoms at age >50 years Unintended weight loss Hematochezia Symptoms that awaken the patient at night Acute or rapidly progressing symptoms Family history of colorectal cancer, celiac, or inflammatory bowel disease Evaluation for the presence of pelvic floor dysfunction

^aCriteria met for the previous 3 months with onset of symptoms at least 6 months before the diagnosis.

BSFS, Bristol Stool Form Scale; GI, gastrointestinal; IBS-C, irritable bowel syndrome with constipation.