Gastroenterology

Rome IV Functional Defecation Disorders calculator

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

Clinical inputs

Meets functional constipation and/or constipation-predominant IBSAbnormal balloon expulsion testAbnormal evacuation pattern on manometry or surface EMGImpaired rectal evacuation on imaging

Months since symptom onset

months

Allowed range: 0–240 months

The source requires symptoms over the last 3 months and onset at least 6 months earlier.

Months the criteria have been fulfilled

months

Allowed range: 0–24 months

The source requires symptoms over the last 3 months and onset at least 6 months earlier.

Result

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Professional use only

For qualified clinicians. Independently verify inputs, calculations, source guidance, and applicability before any clinical action. This calculator does not replace clinical judgment.

Source: Rao SSC, Bharucha AE, Chiarioni G, et al. Anorectal disorders. Gastroenterology. DOI: 10.1053/j.gastro.2016.02.009. PMID: 27144630. A functional defecation disorder requires diagnostic criteria for functional constipation and/or irritable bowel syndrome with constipation, plus features of impaired evacuation on repeated defecation attempts shown by at least 2 of 3 tests: abnormal balloon expulsion, an abnormal anorectal evacuation pattern on manometry or anal surface electromyography, and impaired rectal evacuation by imaging. Criteria are fulfilled for the last 3 months with onset at least 6 months earlier. (2016)

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Clinical inputs

Meets functional constipation and/or constipation-predominant IBS
Abnormal balloon expulsion test
Abnormal evacuation pattern on manometry or surface EMG
Impaired rectal evacuation on imaging
Months since symptom onsetAccepted range: 0 to 240
Months the criteria have been fulfilledAccepted range: 0 to 24

Primary source

Rao SSC, Bharucha AE, Chiarioni G, et al. Anorectal disorders. Gastroenterology. DOI: 10.1053/j.gastro.2016.02.009. PMID: 27144630. A functional defecation disorder requires diagnostic criteria for functional constipation and/or irritable bowel syndrome with constipation, plus features of impaired evacuation on repeated defecation attempts shown by at least 2 of 3 tests: abnormal balloon expulsion, an abnormal anorectal evacuation pattern on manometry or anal surface electromyography, and impaired rectal evacuation by imaging. Criteria are fulfilled for the last 3 months with onset at least 6 months earlier. (2016)

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