Before the colonoscopy pull yellow water and continue to drink water. Do colonoscopy pull yellow water, said the intestinal tract there is still a small portion of feces, need to drink more water, do exercise and other ways to promote excretion, until the pull clear water is considered to be excreted. To do colonoscopy to do intestinal preparation, the clinical usually use polyethylene glycol electrolyte bulk, water to take after the patient many times defecation, clear intestinal contents, to ensure that the colonoscopy of the examination work to start smoothly. If you pull yellow water before colonoscopy, proving that there is still part of the feces in the intestinal tract, not completely clear, will affect the results of colonoscopy, may also lead to intestinal lesions can not be diagnosed in time, at this time, you need to drink more water to promote excretion until the discharge of clear water. Doing colonoscopy need to try to excrete the intestines as clean as possible, can be done under the guidance of the doctor to prepare the intestines, to avoid affecting the results of the colonoscopy.