And to complicate things further, if your doctor finds a small polyp or abnormality on the virtual X-ray test, you will need to take the bowel preparation all over again and return for the standard colonoscopy. Only during the standard colonoscopy can your doctor take a biopsy of a suspicious area or remove a polyp.
So far, most experts say they believe there is nothing better than the full, standard colonoscopy done by a doctor with lots of experience. And the good news is that most GI doctors now have tons of experience doing colonoscopies, so not finding the right doctor is rarely a good excuse.
Far fewer doctors and facilities today have the experience it may take to get the best results with virtual colonoscopy. So stay tuned for more doctor research and experience!
So what do I recommend for all adults?
Starting at age 40 everyone should have a regular rectal exam, which is a preliminary test for colon cancer. It's simple. You roll over on your side and your doctor inserts a gloved finger in your anus. Or you can have the test done during your pelvic exam. It should be routinely performed as part of the bimanual exam; while the patient is in stirrups, the doctor inserts a finger in the rectum to check for masses and to get stool to check for hidden blood.
Starting at age 50 everyone should talk to their doctor about the following:
Colonoscopy: This an examination of the colon with a flexible, lighted tube. It should be performed every 10 years to help screen for colon cancer. If a polyp is found, the test will be repeated more often.
Stool Occult Blood Test: This test is designed to find hidden (occult) blood in the stool. You do it yourself at home using stool cards that you return to your doctor. Your doctor will give you the cards with instructions. The presence of blood can signal precancerous or cancerous polyps in the colon or intestinal bleeding from such causes as a stomach ulcer, internal hemorrhoids or severe colitis. All men and women ages 50 or older should do this test every year.
If you have a family history of polyps, colon cancer or severe colitis, you should talk to your doctor about colon cancer screening earlier and more often. For some, your doctor may suggest you begin with an annual stool check and periodic colonoscopy at age 40, or five years earlier than the age of disease onset for any family member.
Finally, consider asking a friend or family member to get a screening colonoscopy with you. I call it a form of "paying it forward." By encouraging a friend or family member to be tested along with you, one more person will be assured they have done their part to prevent colon cancer.
I encouraged my best friend to have her colonoscopy along with me -- and we laughed and empathized with each other as we drank the necessary liquid to prepare us for the procedure. My friend had a family history of colon cancer, yet she was afraid to be tested. She had tremendous peace of mind when she learned her exam was normal.
With today's technologies, there is no reason anyone should be diagnosed with colon cancer.
Have you been tested for colon cancer? Consider encouraging your partner or friend to be tested, too.
Wishing you good health.
Dr. Marie Savard is an ABC News medical contributor. To learn more about Savard's health management system, download free forms and a sample letter to your doctor, visit http://www.drsavard.com and click on "Learn how to take charge of your health."