For a colonoscopy, a normal colonoscopy is about$300, and for a painless colonoscopy, you need to add the cost of painless anesthesia on top of the$300, which is about$500. A painless colonoscopy is usually 700-800 yuan, and a normal colonoscopy is about 300 yuan. Before having a colonoscopy, you need to eat a small amount of liquid or semi-liquid food the night before. On the day of the test, you will need to prohibit eating any food, drink plenty of water, and drink laxatives to clear your bowels. Before the colonoscopy, if polypectomy or colonoscopy treatment is needed, it usually takes a week to stop taking aspirin or non-steroidal anti-inflammatory drugs, and it is also necessary to complete virus-related tests and coagulation tests to further determine whether the procedure can continue.