Bowel preparation scales are designed to rate the quality of bowel preparation during colonoscopy. The adequacy of bowel preparation during colonoscopy should be assessed and documented routinely. The table below describes the four bowel preparation scales that have been studied and validated.

 

StudyExcellentGoodFairPoor
Aronchick¹% of mucosa surface seen; amount of liquid or solid stool present (global assessment)
>95% >90% >90% (after cleansing) <90%
Ottawa²
0-14
Right, transverse and recto-sigmoid junction scored 0-4; 0-2 for quantity of residual fluid and totaled (0 = best)
0 14
Boston (BPPS)³
9-0
Right, transverse and left colon are scored 0-3 and totaled (9 = best)
9 0
Chicago⁴
36-0
Right, transverse and left colon are scored 0, 5, 10, 11, 12 based on % mucosa seen and totaled (36 = best). There is a separate score for amount of fluid seen.
360

¹Aronchick CA et al. Am J Gastroenterol. 1999; 94: 2667

²Rostom A, Jolicoeur E. Gastrointest Endosc. 2004; 59: 482-486

³Lai EJ et al. Gastrointest Endosc. 2009; 69: 620-625

⁴Gerard DP et al. Clinical and Translational Gastroenterology 2013; 4: e43

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