Colonoscopy is the preferred method for colon cancer screening because colon cancer can be both detected and removed during the same procedure. Other types of screening can detect the presence of cancer cells, but a positive test result means a follow-up colonoscopy will be needed. A quality colonoscopy is the only screening that can both detect and prevent colon cancer. During your colonoscopy, your doctor can find and remove polyps (adenomas) before they have a chance to turn into cancer.
A colonoscopy allows the gastroenterologist to examine the entire length of the colon for polyps, lesions or abnormalities. The patient is under sedation during the entire procedure. Using a colonoscope (a flexible tube with a small camera), the doctor can look for abnormalities and remove them for biopsy and diagnosis.
Those at average risk for colon cancer will likely only need a colonoscopy once every 10 years. Therefore, it is important to research the skill of the gastroenterologist and quality of the procedure. Consider these three factors when finding a specialist to perform your colonoscopy:
According to gastroenterologist, Paul Brown, M.D., of Louisville Endoscopy Center, “Adenoma Detection Rate is the percentage of time that at least one adenomatous polyp is detected during a physician’s screening colonoscopies. Knowing a physician’s ADR is an important qualifying factor in selecting the specialist with whom you feel most confident performing your colonoscopy.”
The national average adenoma detection rate is 25 percent for men and 15 percent for women. When interviewing a gastroenterologist, do not hesitate to ask, “What is your ADR?” Look for a specialist whose ADR percentages are greater than the national average.
During a colonoscopy, the colonoscope should reach the start of the colon (the cecum) to ensure the entire colon has been examined. The cecal intubation rate is how often the physician is able to view the entire length of the colon during colonoscopies. A physician’s cecal intubation rate should be greater than 95 percent for screening colonoscopies. When speaking with a gastroenterologist, it is perfectly reasonable to ask, “What is your cecal intubation rate?”
Another measure of the quality of a colonoscopy is withdrawal time. Colonoscopies require time for the gastroenterologist to scope the entire colon from cecum to rectum for adenomas or polyps. Withdrawal time refers to how quickly the colonoscope is removed from the colon once the scope reaches the cecum. Ask the gastroenterologist, “What is your average withdrawal time for a colonoscopy?” Find a GI specialist with an average withdrawal time that is greater than six minutes, which is associated with a higher ADR.
It is estimated that between 60 and 90 percent of colon cancer deaths could be prevented if everyone over 50 had colonoscopy screenings. If you are currently scheduled for a colonoscopy, read the colonoscopy prep instructions. If you have not yet scheduled a colonoscopy, take a few moments to view some FAQs and find a treatment center near you.