The scope of observation of colonoscopy is wide, the scope of observation of proctoscopy is small, generally if the patient has done colonoscopy, there is no need to do proctoscopy. Enteroscopy mainly refers to the enteroscope from the anus into the observation of the rectum, sigmoid colon, ascending colon and other intestinal wall mucosa, intestinal whether there is a foreign body in the intestinal hyperplasia, and proctoscopy the same from the anus into the rectum, but only observation of the rectum and part of the sigmoid colon of the mucous membranes, the monitoring of the observation of the range of small, so if the patient has done enteroscopy, and there is no abnormality, there is no need to do a proctoscopy. When the patient to do colonoscopy or proctoscopy before, must do a good job of bowel preparation, in advance with laxative drugs, try to empty the intestine, to avoid due to excessive intestinal contents and affect the results of colonoscopy or proctoscopy test.