scale 2

Bowel preparation is critical to a successful colonoscopy. Bowel preparation scales have been validated with variable results. In a systematic review by Robin Parmar et al, 14 citations examined seven scales including the Aronchick Scale, Ottawa Bowel Preparation Quality Scale, Boston Bowel Preparation Scale (BBPS), Harefield Cleansing Scale, Chicago Bowel Preparation Scale, Marden Bowel Preparation Classification and the B-clear.

All the published scales displayed limitations. The BBPS was judged to be the most thoroughly validated scale. Online training for the BBPS is available at


Robin Parmar et al. Validated scales for colon cleansing: a systematic review. Am J Gastroenterol 2016; 111:197-204