Colon Cancer Screening Guidelines

Introduction to Screening

• The American Cancer Society recommends beginning screening at age 45 years for average-risk adults, with colonoscopy every 10 years or annual FIT as first-tier options 1, 2, 3
• The recommendation to start at age 45 is based on rising colorectal cancer incidence in younger adults and similar rates of advanced neoplasia in 45-49 year-olds compared to historical 50-year-old screening cohorts 4, 5

Screening Approach

• For patients with a first-degree relative diagnosed with colorectal cancer or advanced adenoma before age 60, or two first-degree relatives at any age, begin colonoscopy at age 40 or 10 years before the youngest affected relative's diagnosis, whichever comes first 6, 5
• Repeat colonoscopy every 5 years in these higher-risk family history patients 6

Stopping Age for Screening

• Discontinue screening at age 75 for patients who are up-to-date with prior negative screening tests, particularly colonoscopy 4, 5
• Discourage screening beyond age 85 as harms outweigh benefits 1, 2, 4
• Stop screening earlier when life expectancy falls below 10 years regardless of age 4, 5

Screening Test Options and Intervals

• Colonoscopy every 10 years is a preferred screening option 3, 5
• Annual fecal immunochemical test (FIT) is a preferred screening option 3, 5
• Multitarget stool DNA test (FIT-DNA) every 3 years is a tier 2 screening option 1, 2, 5

Critical Follow-Up Requirements

• All positive non-colonoscopy screening tests must be followed by timely diagnostic colonoscopy 1, 2, 5

Quality Metrics for Colonoscopy

• Physicians performing screening colonoscopy must measure and report quality indicators, including cecal intubation rates, withdrawal time, adenoma detection rates, and complication rates 3, 6, 5
• Cecal intubation rates should exceed 90% in screening populations 6, 5
• Withdrawal time should be at least 6 minutes 6
• Adenoma detection rates should be at least 25% in men and 15% in women over 50 3, 6

Risk Stratification

• Ask patients about their history of colorectal cancer or adenomatous polyp, inflammatory bowel disease, and family history of colorectal cancer or adenomatous polyp to determine screening approach 7

High-Risk Conditions

• First-degree relative with colorectal cancer <50 years: Colonoscopy at age 40 or 10 years before diagnosis, repeat every 3-5 years 6
• First-degree relative with colorectal cancer at age 50-59: Colonoscopy at age 40, repeat every 5 years 6
• Two related first-degree relatives at any age: Colonoscopy at age 40 or 10 years before earliest diagnosis, repeat every 3-5 years 6