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Colonoscopy is a procedure that lets your healthcare provider check the inside of your entire large intestine or colon.
The procedure is done using a long, flexible tube (a colonoscope). The tube has a light and tiny camera on one end. It is put in your rectum and moved into your colon.
In addition to letting your provider see the inside of your colon, the tube can be used to:
During a colonoscopy, your provider may remove tissue or abnormal growths (polyps) for further examination. He or she may also be able to treat problems that are found.
The large intestine or colon is the last section of your digestive system. It absorbs water to change waste from liquid to solid stool. The large intestine is about 5 feet long in adults. It has 4 sections:
The rectum joins the anus. This is the opening where stool passes out of your body.
Colonoscopy can help your provider look for problems in your colon. These include any early signs of cancer, red or swollen (inflamed) tissue, open sores (ulcers), and bleeding.
Colonoscopy is also used to screen for colorectal cancer. Screening means looking for cancer in people who don’t have any symptoms of the disease.
A colonoscopy may be used to check and if needed treat things such as:
It may also be used to find the cause of unexplained, long-term (chronic) diarrhea or bleeding in the GI tract (gastrointestinal tract). It can also be used to check the colon after cancer treatment.
Colonoscopy may be used when other tests (such as a barium enema, CT colography, or sigmoidoscopy) show the need for more testing.
Your healthcare provider may have other reasons to recommend a colonoscopy.
As with any invasive procedure, complications may occur. Complications related to colonoscopy include, but are not limited to:
You may have other risks, depending on your condition. Be sure to discuss any concerns with your provider before the procedure.
You may have a colonoscopy as an outpatient or as part of your stay in a hospital. The way the test is done may vary depending on your condition and your healthcare provider's practices.
Generally, the colonoscopy follows this process:
After the procedure, you will be taken to the recovery room to be watched. Your recovery process will depend on the type of sedative you had. Once your blood pressure, pulse, and breathing are stable and you are awake and alert, you will be taken to your hospital room. Or you may be discharged to your home.
You can usually eat whatever you feel you can tolerate after the procedure. Some people start with small, bland meals, and some people do not.
You may pass gas (be flatulent) and feel gas pains after the procedure. This is normal. Walking and moving about may help to ease any mild pain.
You should not drink alcohol for at least 24 hours. You may be asked to drink extra fluids to make up for the water you lost as you got ready for the procedure.
Tell your provider if you have any of the following:
Your healthcare provider may give you other instructions, depending on your situation.
Before you agree to the test or the procedure make sure you know:
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