by Editorial Staff and Contributors
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A colonoscopy is an exam of the colon. The exam is done with a long, thin tube called a scope. This scope has a tiny camera on the end which allows the doctor to see the walls of the colon.
ColonoscopyCopyright © Nucleus Medical Media, Inc. |
The colon is the last part of your intestines. A colonoscopy is used to look for and treat problems in the area. The most common reasons for a colonoscopy are to:
Problems are rare, but all procedures have some risk. Your doctor will talk to you about possible problems such as:
The risk of problems is increased with:
The doctor may ask you about your past health. Other steps may include:
The colon must be cleaned out. Any stool left in the colon will block the view. This process may start several days before the procedure. The doctor will give specific instructions. Bowel movements may be encouraged with 1 of these steps:
In the day before the procedure:
Comfortable clothes should be worn on the day of the colonoscopy. A ride home will be needed.
Medicine may be given to help you relax. You'll probably feel sleepy.
You will lie on your left side. Your knees will be drawn up toward your chest. The scope will be slowly inserted into the rectum. It will inject air into the colon to help open the area. The doctor will slowly pass the scope up into the colon. The camera on the scope will send images to a monitor on the room. The doctor will be able to see the walls of the colon as the scope moves through.
Other tools can be passed through the scope. The tools may remove a sample of tissue or polyps. The tissue can then be sent for testing. The scope will be removed once the doctor is done.
Less than 1 hour
There may be some discomfort when the scope is inserted. Some cramping or lower belly pain can happen during the procedure. Medicine will help to ease discomfort. Some will sleep through the procedure.
Gas pains and cramping are common after. These pains should go away with the passing of gas.
You will remain at the care center until you are able to leave. It may be 1 to 2 hours. It is best to take it easy for the rest of the day. Most can return to normal activity within 24 hours.
It may take 1 to 2 weeks to get results back from tissue sample. Other tests may be needed.
Let your doctor know if recovery is not going as expected or you have any of the following:
If you think you have an emergency, call for emergency medical services right away.
American Society for Gastrointestinal Endoscopy
http://www.asge.org
National Institute of Diabetes and Digestive and Kidney Diseases
http://www.niddk.nih.gov
American Gastroenterological Association
http://www.gastro.org
American Society for Gastrointestinal Endoscopy
https://www.asge.org
Canadian Association of Gastroenterology
https://www.cag-acg.org
Canadian Digestive Health Foundation
http://www.cdhf.ca
Colonoscopy. EBSCO DynaMed website. Available at: http://www.dynamed.com/topics/dmp~AN~T114112/Colonoscopy . Updated October 22, 2019. Accessed January 10, 2020.
Colonoscopy. National Institute of Diabetes and Digestive and Kidney Diseases website. Available at: https://www.niddk.nih.gov/health-information/diagnostic-tests/colonoscopy. Updated July 2017. Accessed January 10, 2020.
National Cancer Institute. Colon cancer treatment (PDQ®)-patient version website. https://www.cancer.gov/types/colorectal/patient/colon-treatment-pdq#link/_93 NIH external link. Updated January 31, 2020. Accessed January 10, 2020.
6/2/2011 DynaMed's Systematic Literature Surveillance http://www.dynamed.com/topics/dmp~AN~T905141/Treatment-for-tobacco-use : Mills E, Eyawo O, Lockhart I, Kelly S, Wu P, Ebbert JO. Smoking cessation reduces postoperative complications: a systematic review and meta-analysis. Am J Med. 2011;124(2):144-154.
Last reviewed September 2019 by
EBSCO Medical Review Board
Daus Mahnke, MD
Last Updated: 10/16/2020