How It Is Done
Colonoscopy may be done in a doctor's
office, clinic, or a hospital. The test is most often done by a doctor who
works with problems of the digestive system (gastroenterologist). The doctor may also have an
assistant. Some family doctors, internists, and surgeons are also trained to do
During the test, you may get a pain medicine and a
sedative put in a vein in your arm (IV). These
medicines help you relax and feel sleepy during the test. You may not remember
much about the test.
Before the test
You will need to take off most of your
clothes. You will be given a gown to wear during the test.
may lie on your left side with your knees pulled up to your belly. Because you will be given medicine during the colonoscopy, you probably won't remember much, if anything, until you wake up after the procedure.
Next, the doctor
will insert a thin, flexible colonoscope in your anus and move it slowly
through the rectum and into your colon. Air will be used to inflate your colon so the doctor can look at the lining of the colon through the
scope or on a computer screen hooked to the scope.
During the test
You may feel
the need to have a bowel movement while the scope is in your colon. You may
also feel some cramping. Breathe deeply and slowly through your mouth to relax
your belly muscles. This should help the cramping. You will likely feel and
hear some air escape around the scope. There is no need to be embarrassed about
it. The passing of air is expected. You may be asked to change your position
during the test.
Your doctor will look at the whole length of your
colon as the scope is gently moved in and then out of your colon.
The doctor may also
use tiny tools, such as forceps, loops, or swabs, through the scope to collect
tissue samples (biopsy) or take out growths. Usually, people do not feel
anything if a biopsy is done or if polyps are taken out.