EGD: 8hr = clear liquid diet(technically up to 2 hour, but preferred 4 hours prior to procedure) 4hr = medication with water 2hr = strict npo(nothing) Colonoscopy 8hr = no food at all but water is ok. 2hr = no liquid neither Patients typically take no food by mouth for four to eight hours prior to the procedure (sometimes longer if there is known or suspected delayed gastric emptying) and no liquids (other than sips with medications) for two hours Enteroscopy Patients should fast after midnight the evening prior to the examination to allow time for food residue to clear the small bowel. In addition, patients undergoing retrograde examinations should receive a bowel preparation to cleanse the colon. cf) ASA- sedation protocol(procedure) The American Society for Anesthesiology (ASA) guidelines state that prior to a procedure, patients should fast a minimum of two hours following clear liquid ingestion or six hours for a light meal