A colonoscopy usually takes 30 to 45 minutes.
If appropriate, the endoscopist may offer you a sedative or painkiller.
The endoscopist will place a flexible telescope into your back passage. Air will be blown into your large bowel to help the endoscopist have a clear view. The endoscopist will be able to look for problems such as inflammation or polyps. They will be able to perform biopsies and take photographs to help make the diagnosis.