Having a colonoscopy in the morning is the same as having one in the afternoon, there is no such thing as which time is better, just do it according to your doctor’s appointment. A colonoscopy can detect the presence of bowel cancer, bowel polyps or inflammatory bowel disease. There are a few preparations that need to be made before the colonoscopy, a bowel cleansing and fasting for 8 hours before the procedure. If the appointment is in the morning, you should not eat after 8:00 p.m. the night before, try to eat some liquid or well-digested food for dinner, and drink a laxative to clean the bowel at 2-3:00 p.m. At night, you need to drink a laxative to clean the bowel. If the appointment is in the afternoon, the bowel should be cleansed in the morning and no food should be eaten in the morning or at noon. The purpose of bowel cleansing before a colonoscopy is to empty the bowel and have a clearer view. Therefore, you will need to take a laxative before the procedure, and you will also need to drink plenty of water until you pass clear stools. Although colonoscopy is invasive, it is relatively safe and adverse reactions rarely occur.