Bristol Stool Form Scale

The Bristol Stool Form Scale is a validated descriptor of stool form and consistency1

Which number best describes your patient's bowel movements?

Modified from original version, © 2006 Rome Foundation. Used with permission.

Download the Bristol Stool Form Scale

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IBS subtypes are based on the predominant stool form pattern, including both frequency and consistency2

IBS-C
(constipation)

>25% hard or lumpy
<25% loose or watery

IBS-D
(diarrhea)

>25% loose or watery
<25% hard or lumpy

IBS-M
(mixed pattern)

>25% hard or lumpy
>25% loose or watery

IBS-U
(unclassified)

<25% hard or lumpy
<25% loose or watery

If your patient has symptoms of IBS, consider showing them the Bristol Stool Form Scale to aid your diagnosis

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References

  1. Lewis SJ, Heaton KW. Scand J Gastroenterol 1997; 32: 920-924.
  2. Longstreth GF et al. Gastroenterology 2006; 130: 1480-1491.