Health Screenings

When Do You Need a Colonoscopy?

USPSTF recommends colorectal cancer screening starting at age 45 — colonoscopy every 10 years for average-risk adults. Colorectal cancer is 90% treatable when found early.

Every 10 years (starting at age 45)

Quick Facts

Recommended Interval

Every 10 years (starting at age 45)

Typical Cost

N/A (covered by most health insurance as preventive care)

Source

USPSTF

Overview

Colorectal cancer is the second leading cause of cancer death in the US and one of the most preventable — when screening catches precancerous polyps before they become cancer. USPSTF updated its Grade B recommendation in 2021 to begin screening at age 45 (down from 50) for average-risk adults, following increased incidence of colorectal cancer in younger adults. Colonoscopy every 10 years is the gold standard, though alternatives including CT colonography every 5 years and annual stool DNA testing (Cologuard) are accepted for average-risk patients. Adults with a family history of colorectal cancer or personal history of inflammatory bowel disease need more frequent screening starting earlier.

Signs You Are Overdue

Age 45 and no prior colorectal cancer screening — schedule now
Prior normal colonoscopy was more than 10 years ago
Any change in bowel habits, rectal bleeding, or unexplained abdominal pain — see a doctor now, don't wait for a scheduled exam
Family history of colorectal cancer or polyps — may require screening every 5 years starting at 40

How to Stay on Schedule

Diet high in fiber and low in red and processed meat is associated with lower colorectal cancer risk
Regular physical activity reduces colorectal cancer risk significantly
Maintain a healthy weight — obesity is a significant risk factor
Limit alcohol consumption — heavy drinking increases colorectal cancer risk
Don't smoke — smoking increases risk of colorectal cancer and many other cancers

What Affects Replacement Cost

Colonoscopy is covered as preventive care (no cost sharing) by most ACA-compliant plans when ordered as routine screening
If polyps are removed during the procedure, the visit may be reclassified as diagnostic — subject to cost sharing
Cologuard (stool DNA test) is an alternative covered by Medicare and most private insurance; $600+ without coverage
Without insurance: $2,000–$5,000 for colonoscopy depending on facility and anesthesia

Why the Schedule Matters

Begin colorectal cancer screening at age 45. If the colonoscopy is normal, the next one is scheduled in 10 years. If polyps are found and removed, the follow-up interval is determined by the number, size, and type of polyps — typically 3–5 years. Never skip or delay this screening because of discomfort with the preparation — the prep has become much easier with newer formulations.

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Pro Tip

The colonoscopy preparation (colon cleansing) is the most commonly cited barrier to completing screening. Newer low-volume preparations (like Sutab or Plenvu) are significantly less burdensome than older gallon-jug preparations. Ask your gastroenterologist about the newest prep options. The procedure itself takes 20–30 minutes and is done under sedation — you will not be aware of it.

Frequently Asked Questions

At what age should you start getting colonoscopies?+

USPSTF (2021 update, Grade B) recommends starting colorectal cancer screening at age 45 for average-risk adults. Adults with a family history of colorectal cancer should begin screening at age 40 or 10 years before the age of the youngest affected family member, whichever is earlier.

Are there alternatives to colonoscopy for colon cancer screening?+

Yes. USPSTF-approved alternatives include CT colonography (virtual colonoscopy) every 5 years, annual fecal immunochemical test (FIT), annual high-sensitivity guaiac fecal occult blood test (gFOBT), or stool DNA (Cologuard) every 1–3 years. Any positive result on these tests requires follow-up colonoscopy. Colonoscopy remains the gold standard because it allows polyp removal in the same procedure.