When should I get a colonoscopy?
Last updated September 3, 2026.
At 45 for most people - the US Preventive Services Task Force recommends colorectal cancer screening from 45 to 75 at average risk. Colonoscopy is the most complete option because it finds and removes precancerous polyps in one session, but at-home stool tests and other scans are accepted alternatives, with a colonoscopy following any positive result. Higher risk means starting earlier; symptoms at any age skip the queue.
What to do
- Start at 45 if average risk. Earlier with a parent or sibling who had colorectal cancer, IBD, or a genetic syndrome.
- Choose a route you will actually do. A yearly stool test done beats a colonoscopy postponed forever.
- Follow a positive home test. Any positive stool test requires a colonoscopy to complete the screening.
- Report symptoms at any age. Blood in stool, lasting bowel changes, or unexplained weight loss are diagnostic-visit triggers, not screening questions.
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