Gastroenterology · Primary Care

Rome IV Functional Constipation calculator

Enter the published formula inputs below to calculate and interpret this score.

Clinical inputs

Straining during more than 25% of defecationsLumpy or hard stools (Bristol 1–2) more than 25% of the timeSensation of incomplete evacuation more than 25% of the timeSensation of anorectal blockage more than 25% of the timeManual maneuvers to facilitate more than 25% of defecationsFewer than 3 spontaneous bowel movements per weekLoose stools are rare without laxativesCriteria for IBS are not met

Months since symptom onset

months

Allowed range: 0–240 months

Months in the past year during which criteria were met

months

Allowed range: 0–12 months

Result

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Clinical inputs

Straining during more than 25% of defecations
Lumpy or hard stools (Bristol 1–2) more than 25% of the time
Sensation of incomplete evacuation more than 25% of the time
Sensation of anorectal blockage more than 25% of the time
Manual maneuvers to facilitate more than 25% of defecations
Fewer than 3 spontaneous bowel movements per week
Loose stools are rare without laxatives
Criteria for IBS are not met
Months since symptom onsetAccepted range: 0 to 240
Months in the past year during which criteria were metAccepted range: 0 to 12

Primary source

Lacy BE et al. Bowel disorders. Gastroenterology. PMID: 27144627. Functional constipation requires at least 2 of 6 bowel features, loose stools rarely present without laxatives, insufficient criteria for IBS, symptom onset at least 6 months earlier, and criteria met for the last 3 months. (2016)

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