Colonoscopy allows the physician to look inside your entire large intestine, from the lowest part—the rectum—all the way up through the colon to the lower end of the small intestine. The procedure is used to look for early signs of cancer in the colon and rectum. It is also used to diagnose the causes of unexplained changes in bowel habits. Colonoscopy enables the physician to see inflamed tissue, abnormal growths, ulcers, and bleeding.
For the procedure, you will lie on your left side on the examining table. You will probably be given pain medication and a mild sedative to keep you comfortable and to help you relax during the exam. The physician will insert a long, flexible, lighted tube into your rectum and slowly guide it into your colon. The tube is called a colonoscope. The scope transmits an image of the inside of the colon so the physician can carefully examine the lining of the colon. The scope bends so the physician can move it around the curves of your colon. You may be asked to change position occasionally to help the physician move the scope. The scope also blows air into your colon, which inflates the colon and helps the physician to see well.
If anything abnormal is seen in your colon, like a polyp or inflamed tissue, the physician can remove all or part of it using tiny instruments passed through the scope. That tissue (biopsy) is then sent to a lab for testing. If there is bleeding in the colon, the physician can pass a laser, heater probe, or electrical probe, or can inject special medicines through the scope and use it to stop the bleeding.
Bleeding and puncture of the colon are possible complications of colonoscopy; however, such complications are uncommon.
Your colon must be completely empty for the colonoscopy to be thorough and safe. To prepare for the procedure your physician will give you specific instructions. Inform your physician of any medical conditions or medications that you take before the colonoscopy.
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