Enteroscopy enters the intestinal tract about 90~100 centimeters, and the exact length varies from person to person. Enteroscopy is not based on the length of entry into the intestinal tract to decide whether the examination is finished or not, but rather on the situation observed during the examination. Because each person is different in weight and thinness, and different in height, the length of the colonoscope into the intestinal tract also varies. Some may enter the intestinal tract 70~80 centimeters, while some patients may need to enter 90~100 centimeters to complete the examination. When doing colonoscopy, the parts to be examined are rectum, sigmoid colon, descending colon, transverse colon, ascending colon, and ileocecal part. When the colonoscope enters into the intestinal tract, it is necessary to observe these parts carefully to find out whether the intestinal mucosa is changed or not, and it is not based on the length of the colonoscope entering into the intestinal tract that a decision is made whether or not to end the examination, with the aim of arriving at the ileocecal part to see the appendix, the end of the ileum and so on.