Colorectal Cancer Screening Guidelines

Screening Methods and Intervals

• The American College of Physicians and the US Preventive Services Task Force recommend colonoscopy as the preferred colorectal cancer screening method, with a 10-year screening interval, for individuals aged 45-75 years, due to its superior ability to detect and remove precancerous polyps in a single session 1, 2, 3
• Annual FIT (Fecal Immunochemical Test) is considered a first-tier option alongside colonoscopy, while CT Colonography every 5 years and Flexible sigmoidoscopy every 5 years are alternative options, although they may require follow-up colonoscopy if positive 2, 3, 4
• The following table summarizes the recommended screening methods and intervals:

4, 5

Procedure and Effectiveness

• Sedation is usually used during colonoscopy, requiring transportation assistance and recovery time, and the effectiveness of colonoscopy depends on quality indicators such as cecal intubation rates, withdrawal time, and adenoma detection rates 1, 2

Risk and Benefits

• The benefits of colonoscopy significantly outweigh risks for individuals aged 66 years, although serious adverse events can occur, including perforations and major bleeding, with a higher risk of complications in those over 75 years 1, 2, 3, 6
• The American Cancer Society recommends starting colorectal cancer screening at age 45 for average-risk individuals, with a "qualified recommendation", and regular screening in adults aged 50 years and older as a "strong recommendation" 4
• Average-risk individuals should begin screening at age 45, while increased-risk individuals, such as those with a family history of colorectal cancer, should begin screening earlier, at age 40 or 10 years before the age of diagnosis of the youngest affected relative, whichever is earlier, and African American individuals may benefit from starting screening at age 40 due to higher CRC incidence 4, 5, 7, 8, 9
• Screening decisions for adults aged 76-85 years should be individualized based on prior screening history, overall health status and comorbidities, life expectancy, and patient preferences, with a consideration to stop screening if life expectancy is less than 10 years, and the American Cancer Society specifically discourages screening over age 85 years 8, 9, 6, 4

Cost-Effectiveness and Recommendations

• Modeling studies demonstrate acceptable cost-effectiveness of average-risk screening starting at age 45, with an estimated cost of $7,700 per quality-adjusted life-year gained, and the USPSTF recommends screening for colorectal cancer in adults aged 45-49 years with moderate certainty that screening has moderate net benefit (Grade B recommendation) 5, 7, 2