Colon Cancer Screening Interval Calculator

Work out colon cancer screening interval instantly with clear inputs, formula shown and shareable results.

About Colon Cancer Screening Interval Calculator

Applies the US Multi-Society Task Force post-polypectomy surveillance intervals based on adenoma number, size and histology.

Formula

MSTF 2020 surveillance intervals

Normal 10 years; 1-2 small tubular adenomas 7-10 years; 3-4 small 3-5 years; 5-10 small 3 years; any adenoma >=10 mm or advanced histology 3 years; more than 10 adenomas 1 year

Worked example

With the default values below, Colon Cancer Screening Interval Calculator returns Suggested surveillance interval of 8. Change any input above and every figure here is recalculated in your browser.

Inputs used

Adenomas removedaccepts 0–20: 2
Largest adenoma sizeaccepts 0–60 mm: 6 mm
Advanced histology presentone of Yes (villous, high-grade dysplasia), No: No

Results

Suggested surveillance interval: 8 years
Basis for the interval: 1 to 2 small tubular adenomas — 7 to 10 year interval
Interval in months: 96
Assumption: Interval assumes complete resection and adequate bowel preparation

Step by step

1Values used
2MSTF 2020 surveillance intervals
3Suggested surveillance interval= 8 years
4Basis for the interval= 1 to 2 small tubular adenomas — 7 to 10 year interval
5Interval in months= 96
6Assumption= Interval assumes complete resection and adequate bowel preparation

Assumptions and limits

The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to whole numbers, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
This is an estimate for general information and not professional medical advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.

Frequently Asked Questions

What if bowel preparation was poor?

The examination is repeated early, usually within a year, rather than following the standard interval.

Do sessile serrated lesions differ?

They follow their own intervals, generally similar to adenomas of the same size and number.