Triiotrast (Triiotrastum; synonym Natrii acetrizoas) is a contrast agent. Triyotrast used for x-ray examination of the renal pelvis, ureter, bladder, as well as blood vessels (except brain vessels) and the heart. Depending on the objectives of the study, from 20 to 60 ml of a 30–70% solution is heated in, heated to body temperature. Forms of triotrast release: 10 ml ampoules of 30, 50, 70% solution, 20 ml ampoules of 50, 70% solution and 2 ml ampoules of 30 ml, 50 mg, 50 mg, 50% solution. Keep in a cool dark place. See also Contrast agents .