human
What are the most important things I should know about colonoscopies?
assistant
1.  The purpose of a colonoscopy is to examine and diagnose any abnormalities in the large intestine, such as polyps or cancerous growths.
2.  You will be asked to fast for at least eight hours before your procedure.
3.  Your doctor will give you a sedative to help you relax during the examination.
4.  You may feel some cramping and bloating after the exam.