1, Gastroscopy: fasting with no food and water for 6-8 hours on an empty stomach, no laxatives. 2.Ultrasound gastroscopy: same as gastroscopy, with anesthesia appointment if possible. 3, ERCP: same as gastroscopy, but also need sedation with Valium and Dulcolax! 4.Colonoscopy: the day before the examination, less residue diet. Drink laxatives 6 hours in advance, no food and water after drinking laxatives. 5, small intestine microscopy: the same as colonoscopy. 6.Capsule endoscopy: the same as colonoscopy. 7.Ultrasound colonoscopy: the same as colonoscopy, with anesthesia appointment if possible. 8, painless endoscopy = endoscopy + intravenous anesthesia.