Key Takeaways
- Clinical Bottom Line
- Surveillance intervals only apply after a high-quality baseline exam
- What is still current in 2026
- Before assigning an interval, ask 5 questions
Clinical Bottom Line
| Baseline finding after a high-quality colonoscopy | Recommended interval |
|---|---|
| Normal colonoscopy | 10 years |
| 1-2 tubular adenomas <10 mm | 7-10 years |
| 3-4 tubular adenomas <10 mm | 3-5 years |
| 5-10 adenomas <10 mm, or any adenoma >=10 mm, villous features, or high-grade dysplasia | 3 years |
| >10 adenomas | 1 year and consider genetic evaluation |
| 1-2 SSPs <10 mm | 5-10 years |
| 3-4 SSPs <10 mm | 3-5 years |
| SSP >=10 mm, SSP with dysplasia, or TSA | 3 years |
| Piecemeal resection of adenoma or SSP >=20 mm | 6 months |
Surveillance intervals only apply after a high-quality baseline exam
Surveillance intervals are valid only after a high-quality baseline colonoscopy with adequate prep, complete cecal intubation, careful inspection, and confident complete resection. If that foundation is weak, the interval table becomes false reassurance.
What is still current in 2026
The core U.S. surveillance intervals are still anchored to the 2020 U.S. Multi-Society Task Force update. There has not been a new U.S. interval rewrite in 2025 or 2026. What has changed is the quality framework around the baseline exam:
- The 2024 ACG/ASGE quality indicators raised the bar for what counts as a high-quality colonoscopy.
- The 2025 bowel prep update defined “adequate” prep as prep good enough to assign standard screening or surveillance intervals.
- The 2024 AGA polypectomy update reinforced cold snare as the default technique for polyps <10 mm, which matters because incomplete or heat-distorted resection can distort downstream interval decisions.
Before assigning an interval, ask 5 questions
| Quality checkpoint | Why it changes surveillance decisions |
|---|---|
| Was the prep adequate? | If the prep was not good enough to detect clinically relevant lesions, standard intervals do not apply. |
| Was the exam complete to cecum? | An incomplete exam can downgrade a patient incorrectly into a lower-risk surveillance bucket. |
| Was inspection quality credible? | ADR, SSLDR, withdrawal technique, distention, cleaning, and fold exposure determine how much you can trust a “low-risk” result. |
| Was resection complete? | Piecemeal removal, difficult morphology, or uncertain margins shorten follow-up regardless of the simple interval chart. |
| Is this an average-risk patient? | These intervals do not override hereditary syndromes, inflammatory bowel disease surveillance programs, prior CRC resection, or major family-history pathways. |
The current quality bar is higher than many interval charts assume
The 2024 quality indicators are a major reason this topic deserves a refresh. Current priorities include bowel prep adequacy >=90%, cecal intubation >=95%, ADR >=35% across screening, surveillance, and diagnostic colonoscopies in adults older than 45 years, SSL detection rate >=6%, and an average withdrawal time closer to 8 minutes in normal examinations. If your baseline exam misses these marks, a nominal 7-10 year recommendation after 1-2 small adenomas is harder to defend.
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