A colonoscopy is a visual exam of the inner lining of the large intestine
(colon) to check for growths, colorectal polyps and other abnormalities.
Your doctor may perform a colonoscopy to screen for colon cancer or evaluate
other experienced problems, including blood loss, abdominal or rectal
pain, changes in bowel habits or persistent bleeding.
Preparing for the procedure
Your colon must be empty prior to the procedure. There are different ways
empty your colon in order to prepare for a colonoscopy. Your doctor will
advise the best preparation method for you as well as specific drinking
and eating instructions. It is important to make sure you get additional
instructions from your doctor prior to the procedure if you are:
- Taking a blood thinner
- Have experienced a heart attack or stroke in the past six months
- Have an artificial heart valve or heart defibrillator
- If you may be pregnant
Your doctor may give you a prescription laxative tablet or drink solution
the evening before your scheduled exam. Nausea is a common side effect
of the laxative due to the bitter taste. Ask your doctor if it's ok
for you to drink clear liquids or lemon juice to neutralize the taste
of the laxative. Do not eat any solid foods after taking the laxative.
It is important to follow the instructions provided by your physician's office.
During the procedure
While lying on your left side with your knees pulled inward, a flexible
tube (a colonoscope) with a camera at the end is inserted into the rectum
to view your colon. Polyps or growths found during the procedure are typically
removed and sent to the lab for further testing. It is normal to feel
cramping or the need to have a bowl movement during the procedure. The
test usually takes 20-30 minutes, depending on what your doctor finds
during the exam. You will need to arrange for transportation home from
the hospital since a sedative and intravenous pain medication is administered
before the procedure.