Gastroenterology · Primary Care

Rome IV Functional Diarrhea calculator

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

Clinical inputs

Loose or watery stools (Bristol 6–7) in more than 25% of stoolsHard stools (Bristol 1–2) in fewer than 25% of stoolsCriteria 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

Loose or watery stools (Bristol 6–7) in more than 25% of stools
Hard stools (Bristol 1–2) in fewer than 25% of stools
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. Loose or watery stools (Bristol 6–7) in more than 25% of stools, hard stools in fewer than 25%, insufficient criteria for IBS, onset at least 6 months earlier, and criteria met for the last 3 months. (2016)

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