Intravenous urography (IVU) is a procedure used to give a clear X-ray picture of the urinary tract. The procedure involves intravenous injection of a contrast medium (a substance that shows up on X-rays) into the arm. The contrast medium is carried in the blood to the urinary system, where it is filtered through the kidneys and then passes into the ureters and bladder to be excreted in the urine. X-rays taken at intervals show outlines of the kidneys, ureters, and bladder. IVU detects abnormalities, such as tumours and obstructions, and signs of kidney disease.
From the 2010 revision of the Complete Home Medical Guide © Dorling Kindersley Limited.