6. Risks and limitations
While virtual colonoscopy is generally safe, it comes with some risks and limitations to consider:
- Bowel perforation: Inflating the colon with air carries a rare risk of causing a tear in the colon wall.
- Radiation exposure: The CT scan uses low-dose X-rays. Although the radiation levels are considered safe, repeated exposure should be minimized.
- Missed small polyps: Virtual colonoscopy may not detect very small polyps smaller than 6 millimeters as reliably as traditional colonoscopy.
- Follow-up procedures: If polyps are found, you will still need a traditional colonoscopy to remove them.
Your healthcare provider will review your medical history and medications to ensure virtual colonoscopy is appropriate for you.
7. Post-test expectations
After the procedure, you can return to your normal activities immediately since sedation is not used. You can eat and drink as usual unless your provider advises otherwise.
You might experience some mild side effects such as abdominal bloating or cramping caused by the air introduced into your colon. Passing gas usually relieves this discomfort quickly.
8. Understanding results
If the virtual colonoscopy detects polyps or other abnormalities, this does not confirm cancer but indicates the need for further evaluation. You will typically be scheduled for a traditional colonoscopy to remove the polyps and obtain tissue samples if necessary.
In some cases, the scan may reveal incidental findings in other abdominal organs, prompting additional diagnostic tests.
If the test results are normal, your healthcare provider will advise when to repeat colorectal cancer screening. For individuals with low risk, this interval may be every five years.
