mercaptoacetyltriglycine: a tracer used in nuclear medicine, during *renography, when labelled with technetium-99m. This agent is cleared by glomerular filtration and tubular secretion by the kidneys. It can be used to measure effective renal plasma flow and to give anatomical information. Compared with a *DTPA scan, it can be used in patients with impaired renal function.
(isotope renography) n. the radiological study of the kidneys by a *gamma camera following the intravenous injection of a radioactive *tracer, which is concentrated and excreted by the kidneys. The radioactive isotope (usually *technetium-99m) emits gamma rays, which are recorded by the camera positioned over the kidneys. A graph of the radioactivity in each kidney over time provides information on its function and rate of drainage. See DMSA; DTPA; MAG3.... renography
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