Colon Cancer Screening Guidelines

Screening Initiation and Options

The American Cancer Society recommends beginning colon cancer screening at age 45, but this is a "qualified recommendation" with less certainty compared to their "strong recommendation" for age 50 and older 1
Traditional screening age remains 50 years for average-risk individuals without symptoms, family history, or other risk factors, as recommended by the National Comprehensive Cancer Network 3, 4, 2
Colonoscopy every 10 years or annual fecal immunochemical test (FIT) are the cornerstone screening tests that should be offered first, according to the U.S. Multi-Society Task Force 2, 4
Annual FIT is a non-invasive, stool-based test with superior sensitivity compared to guaiac-based tests, as recommended by the National Comprehensive Cancer Network 3, 2

If a first-degree relative is diagnosed with colorectal cancer at age ≥60, screening should begin at age 40 with average-risk options, as recommended by the American Cancer Society 5
If a first-degree relative is diagnosed with colorectal cancer at age <60, colonoscopy should begin at age 40 or 10 years before the relative's diagnosis age (whichever is earlier), repeat every 5 years, as recommended by the U.S. Multi-Society Task Force 2, 5

Any colorectal symptoms warrant immediate diagnostic evaluation, regardless of age, and hematochezia, melena, or iron deficiency anemia require colonoscopy, not screening tests, as recommended by the American Gastroenterological Association 4
The adenoma detection rate should be ≥25% in men, and cecal intubation rate and adequate withdrawal time (≥6 minutes) are important quality indicators for colonoscopy, as recommended by the National Comprehensive Cancer Network and the U.S. Multi-Society Task Force 2, 4, 6