Checking for colon cancer isn't the sexiest topic on your to-do list — but it might be the most important one. The good news is that screenings have come a long way.
Today, you can choose a traditional colonoscopy with a GI specialist who focuses on patient comfort and safety, or an at-home test that promises convenience without a procedure. So, which one is the smarter move?
“The best screening test is the one you’re willing to complete,” says Deepa Shah, MD, gastroenterologist at HonorHealth. We’re breaking down the pros and cons of each test to help you decide which option makes the most sense for you.
The gold standard of screenings
With a colonoscopy, your doctor examines the entire colon using a flexible camera. This outpatient procedure is considered the gold standard for colon cancer screening because it's both diagnostic and therapeutic, says Dr. Shah.
“A colonoscopy allows us to see the colon directly, in real time, and address issues immediately,” she explains. “That level of detail is what makes it such a powerful tool.” Colonoscopy is recommended starting at age 45.
During the procedure, doctors can detect everything from polyps and precancerous lesions to colon cancer and hemorrhoids. They can also remove polyps before they become cancerous.
Benefits of colonoscopy
- Most accurate screening test available
- Direct visualization of the entire colon
- Docs can remove polyps in the same procedure
- If results and risk level are normal, you won't need another one for 10 years
Drawbacks
- Requires bowel prep and anesthesia
- Small risk of bleeding, infection, perforation or reaction to medication
- Time off work and the need for a driver
A colonoscopy requires more time and effort, but the reward is unmatched accuracy and the ability to stop cancer before it starts.
Convenient at-home testing options
Several companies now offer at-home stool tests that look for traces of blood, abnormal DNA markers that may indicate cancer or advanced precancerous polyps, or both. “At-home test kits are a non-invasive option that can work for people at average risk who may be hesitant about a procedure,” Dr. Shah notes.
Benefits of home testing kits
- No prep or sedation
- Completed at home on your schedule
- No need to miss work
Drawbacks
- If the test is positive, a colonoscopy is required anyway
- Less sensitive for smaller polyps
- Higher false-positive rates in patients over 70
- Diagnostic only — it cannot remove polyps
These types of tests are typically repeated every one to three years if results are negative and you don’t have additional risk factors. “An at-home stool test doesn’t replace colonoscopy,” Dr. Shah emphasizes. “It can help identify who needs one, but it doesn’t offer the same level of protection.”
Why is colon screening so important?
Colon cancer often develops quietly, without symptoms. Screening finds cancer early, when it is most treatable — doctors may be able to stop it before it starts by removing precancerous polyps. “Screening saves lives. And starting at the recommended age can make a big difference,” Dr. Shah emphasizes.
Whether you choose a colonoscopy or an at-home test, the key is taking action. Because when it comes to colon cancer, doing something is always better than doing nothing at all.