The distance of entry for colonoscopy is usually 70-80cm, some thin and short patients may enter 50-60cm, and tall and fat patients may enter 100-110cm in order to complete the colonoscopy. Generally do enteroscopy into the mirror 70-80cm to reach the ileocecal or ileocecal end, but decide whether the end of the examination is based on whether to complete the observation of all the colon, and not based on the length of the mirror. The length of the bowel to be observed will vary depending on how tall or short, fat or thin the person is. For example, some thin and short patients can complete the above examination with a 50-60cm scope, while tall and fat patients may need a 100-110cm scope. The colon includes the rectum, sigmoid colon, descending colon, transverse colon, ascending colon, and ileocecal region, and all of the above parts are carefully observed throughout the colonoscopy process. Some patients also have to pass through the ileocecal valve into the end of the ileum, that is, to observe a small section of the mucosa of the small intestine changes, at this point can be considered to have completed the examination. If you are a patient who needs a colonoscopy, it is recommended that you go to a regular hospital to avoid taking additional risks.