Colonoscopy is the most routine examination means in gastroenterology, which can find out whether there are lesions in the rectum, sigmoid colon and colon. It is divided into general colonoscopy and painless colonoscopy, and the cost of the examination is directly related to the level of the hospital, the economic level of the region where the hospital is located and the way of examination, as follows: 1, usually the cost of general colonoscopy in tertiary hospitals is about 300 yuan, the cost of colonoscopy in economically developed regions such as Beijing, Shanghai, Guangzhou, etc. is relatively expensive, and the cost of general colonoscopy in hospitals in the mainland and hospitals of lower levels is relatively cheap; 2, the cost of painless colonoscopy is more expensive. The cost of painless colonoscopy is more expensive and requires anesthesia on top of general colonoscopy, with the cost of anesthesia generally around 700 yuan and the need to take laxatives to empty the intestines before colonoscopy, with the cost of laxatives at around 100 yuan. In addition, colonoscopy as an invasive test must check the four preoperative items, including hepatitis B surface antigen, hepatitis C antibody, AIDS antibody, syphilis antibody, the cost is about 200 yuan. Older patients will also need to have an electrocardiogram, which costs about $30. The overall cost will be higher if cardiopulmonary function, blood work, coagulation, etc. need to be evaluated. Therefore, the overall cost also depends on the individual case and cannot be generalized.