Colonoscopy vs. Cologuard — What NJ Patients Should Know

If you've recently turned 45 — or if you're overdue for a colon cancer screening — you may have heard about Cologuard, the at-home stool DNA test advertised heavily on television. And you may be wondering: do I really need a colonoscopy, or can I just use the mail-in test?

It's a fair question. Here's what we tell our patients.

What Cologuard Does

Cologuard tests a stool sample for DNA changes and blood associated with colorectal cancer or precancerous polyps. It's non-invasive, requires no bowel prep, and can be done at home. If the result is negative, no further testing is needed for three years. Those are real advantages, particularly for patients who are anxious about colonoscopy or have difficulty getting to an appointment.

What Cologuard Cannot Do

Cologuard can detect signs that cancer may be present — but it cannot remove polyps or prevent cancer from forming. If your Cologuard test comes back positive, you still need a colonoscopy. And a positive Cologuard result can trigger insurance complications: some plans reclassify the follow-up colonoscopy from a preventive procedure (covered at 100%) to a diagnostic procedure (subject to your deductible and copay). That can mean hundreds or thousands of dollars out of pocket.

Cologuard also has a higher false positive rate than colonoscopy. That means some patients who receive a positive result won't have cancer or significant polyps — but they'll still need to go through the colonoscopy to confirm.

Colonoscopy: The Gold Standard

Colonoscopy is the only screening test that can both detect and remove polyps in a single procedure. That's why every major gastroenterology society — including the American Gastroenterological Association and the American Society for Gastrointestinal Endoscopy — considers it the gold standard for colorectal cancer prevention.

For average-risk patients, a normal colonoscopy result means you won't need another for 10 years. Cologuard must be repeated every three years.

Under the Affordable Care Act, preventive colonoscopy is covered at 100% for average-risk patients — no copay, no deductible.

Who Should Consider Cologuard?

Cologuard is a reasonable option for average-risk patients who are not willing or able to undergo colonoscopy. It is not appropriate for patients with a personal history of polyps or colorectal cancer, a family history of colon cancer, inflammatory bowel disease, or GI symptoms. If you fall into any of these categories, colonoscopy is the recommended approach.

Our Recommendation

If you're eligible for a covered preventive colonoscopy, we generally recommend it over Cologuard. You get a more accurate test, the ability to remove polyps immediately, a 10-year window before your next screening, and in most cases, no out-of-pocket cost. That's a compelling combination.

If you're unsure which option is right for you, we're happy to discuss your individual risk profile and help you decide. Our goal is to make sure you get screened — and screened effectively.

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