Boston bowel preparation scale

The BBPS. A: Segment score 0, unprepared colon segment with mucosa not seen because of solid stool that cannot be cleared. B: Segment score 1, portion of mucosa of the colon segment seen, but other areas of the colon segment not well seen because of staining, residual stool, and/or opaque liquid. C: Segment score 2, minor amount of residual staining, small fragments of stool and/or opaque liquid, but mucosa of colon segment seen well. D: Segment score 3, entire mucosa of colon segment seen well with no residual staining, small fragments of stool and/or opaque liquid.