Post-Polypectomy Surveillance Interval
Returns the US Multi-Society Task Force interval to the next colonoscopy after polypectomy.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- The examination was complete to the cecum
- Yes
- The bowel preparation was adequate
- Yes
- Worst histology found
- Tubular adenoma
- Number of adenomas
- 1
- Largest adenoma, mm
- 12 mm
Result: next colonoscopy in 3 years, on a single adenoma of 12 mm
The tool opens with these values already filled in. Replace them with your own.
What the result means
- 10 years
- A normal examination, or hyperplastic polyps under 10 mm confined to the rectum or sigmoid.
- 7 to 10, then 3 to 5 years
- One or two tubular adenomas under 10 mm is seven to ten years; three or four is three to five years.
- 3 years
- Five to ten adenomas under 10 mm; or any adenoma 10 mm or larger, villous or tubulovillous, or with high-grade dysplasia, whatever the count.
- 1 year, and 6 months
- More than ten adenomas is one year. Piecemeal resection of an adenoma 20 mm or larger is six months, and that is a completeness check rather than surveillance.
- The precondition
- Every interval presumes a complete examination to the cecum with an adequate preparation. Without both, no number applies and the recommendation is an early repeat.
- What it does not cover
- Average-risk surveillance after polypectomy only. Not a personal or family history that puts a patient on a different schedule, and not inflammatory bowel disease.
What you enter
- The examination was complete to the cecum
- The bowel preparation was adequate
- Worst histology found
- Number of adenomas
- Largest adenoma, mm (10 mm or larger shortens the interval to 3 years on its own)
- High-grade dysplasia (shortens the interval to 3 years on its own)
- Piecemeal resection of an adenoma 20 mm or larger (a 6-month completeness check that outranks the table)
How this is calculated
Gupta S, Lieberman D, Anderson JC, et al. Recommendations for Follow-Up After Colonoscopy and Polypectomy: A Consensus Update by the US Multi-Society Task Force on Colorectal Cancer. Gastroenterology. 2020;158(4):1131-1153. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.