What are the precautions for colonoscopy? First, the examination before the preparation: the day before the examination do not eat fiber-rich vegetables and fruits, the day before the dinner into the semi-fluid less residue diet, such as thin rice, slim, etc., do not eat vegetables and watermelon and other fruits with seeds, fasting on the day of the examination. Clean bowel precautions: 1, colonoscopy requires oral medication to clean the intestinal tract, commonly used and Sharp (compound polyethylene glycol electrolyte dispersions), add 2000ml of water and take it orally (due to the different specifications of the drug, please pay attention to the instructions of the drug for details). 2, oral laxative time: 5-6 hours before the examination to start oral medication. 3.If there is no obvious discomfort from the oral medication, try to finish the medication and water in 1 hour, and do not finish it in more than 2 hours at the longest. Drink enough water, then do not need to drink again, must be appropriate activities to promote intestinal peristalsis. Generally in the oral medication half an hour to start defecation, defecation 5-7 times or more, until the final elimination of stool was water or light yellow, for the best intestinal cleansing effect. 4, intestinal preparation, if not sufficient, directly affect the enema on the intestine, such as not clean, need to re-orally intestinal preparation for the drug. 5.Severe constipation, oral laxatives can be taken 2 days before the examination. Second, during the examination: take the left side lying position, relax the whole body after intubation, make the anal sphincter relax, if there is any discomfort promptly inform. Third, after the examination: 1, take the biopsy for pathological examination, 2 hours later can enter warm cool water, 4 hours to eat warm cool liquid diet, 1-2 days should eat thin rice, noodles and other food with little residue, do not strenuous activities within three days. 2.Initially, due to the accumulation of air in the intestines, you may feel bloating and discomfort, which usually disappears gradually after a few hours. 3.Diet on the day after the examination should be light and soft food. If there is persistent abdominal pain or blood in the stool, consult the hospital in time.