GI Endoscopy · 6 min read
BBPS 9 vs 6: When a Perfect Right Colon Is Worth the Extra Wash
Adequate is 6 with no segment under 2. A 9 is extra right-colon work for flat serrated lesions, not a dashboard requirement.
A total of 9 is three clean segments after washing. Quality programs do not require it. Calderwood's adequate definition is 6 with every segment at least 2. The reason to keep washing the right colon toward a 3 is sessile serrated lesions: pale, mucus-capped, easy to hide in a film that still scores 2. Split-dose gets you into the 2s. The extra minute of water is how a 2 becomes a 3.
Experienced teaching points
Clinical Pearls
Clinical Bottom Line
| Score pattern | What to do |
|---|---|
| 2-2-2 or better (total 6-9) | Adequate. Assign the interval the polyps earned. A 9 is nicer, not required (Calderwood 2014, PMID 24629422). |
| Right colon 3 versus 2 | Both count as adequate. A 3 is the extra wash that uncovers a mucus cap. Worth the minute in the cecum. Not a reason to repeat a 2. |
| Any segment 1 after a real wash | Inadequate segment. Do not hide it inside a total of 6. Repeat, usually within a year, or at least far sooner than the polyp interval. |
| How to get a right-colon 3 | Split-dose. Water on insertion. Sit in the cecum and wash bile. Then inspect. BBPS scoring page. |
Is a 9 the quality target?
No. ACG/ASGE 2024 tracks an adequate-prep rate, not a perfect-prep rate. Adequate in BBPS language is total 6 or more with no segment under 2. Lai's original validation even used a cutoff of 5 versus under 5 for polyp detection. Treating 9 as a unit mandate invents a metric societies did not write.
Calderwood 2010 is the reason people remember 8 and 9: every rater said those videos were adequate to exclude polyps larger than 5 mm. At a total of 6, 82% said the same. At 5, 33%. At 4 or less, nobody. That is a confidence curve, not a rule that 6 is dirty.
Why wash the right colon toward a 3?
Sessile serrated lesions sit in the proximal colon, sit flat, and sit under mucus. A segment score of 2 means you can see mucosa after suction. It does not mean you have washed every haustral face. The extra water that turns a 2 into a 3 is often the difference between "I saw colon" and "I saw the pale cloud." Recognition and resection: SSL page.
Do not confuse that extra minute with an inadequate exam. If the right colon is a true 2, the interval stands. If the right colon is a 1 because you were late and tired, that is an inadequate segment no matter what the left colon looks like.
Selected references
- Calderwood AH, et al. Boston Bowel Preparation Scale scores provide a standardized definition of adequate. Gastrointest Endosc. 2014;80:269-276.
- Calderwood AH, Jacobson BC. Comprehensive validation of the Boston Bowel Preparation Scale. Gastrointest Endosc. 2010;72:686-692.
- Lai EJ, et al. The Boston bowel preparation scale. Gastrointest Endosc. 2009;69:620-625.
- Rex DK, et al. Quality indicators for colonoscopy. Am J Gastroenterol. 2024;119:1754-1780.
Last reviewed September 20, 2026. Written for clinicians who already score BBPS and want to know whether chasing a 9 changes SSL detection.
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