During the test
A colonoscopy may be done in a doctor's office, clinic, or hospital, and it usually takes approximately 30 to 45 minutes.
You will be asked to put on a gown and lie on your side, with your knees drawn to your chest. Your doctor will first conduct a rectal exam to make sure that there is no obstruction, before inserting the colonoscope into your anus to look at the lining of the colon on a screen as it moves through your colon. You may be asked to change positions during the test so that the doctor can better examine different areas of the colon.
The scope will pump air to inflate your colon. You may feel the need to have a bowel movement, pressure, or some cramping while the scope is in your colon. Taking slow deep breaths may help with some of these symptoms.
After the test
You will be asked to stay and be watched for 1 to 2 hours. You should not drive or operate machinery for 24 hours after the test. You should drink a lot of fluid to keep hydrated and start eating solid food as your doctor instructs you.
It is normal to see some blood in your first bowel movement after the test. However, you should conduct your doctor if you continue to pass blood or blood clots, or if you have a fever or severe abdominal pain.
Your doctor may be able to tell you the results of the visual examination immediately. If a tissue sample was taken to be analyzed in a lab, it may take a few weeks to receive the results. If your doctor found any abnormality through this test, more tests or procedures may be ordered.