Dynamic renal scintigraphy provides functional information about each renal tract. The isotopes most commonly used are:
- diethylenetriamine penta-acetic acid - DTPA - labelled with 99m technetium
- mercaptoacetylglycine - MAG3 - labelled with 99m technetium
- hippuran labelled with iodine 131
Radionuclide cystography is a variation on this method that is used to study patients with suspected vesico-ureteric reflux. The degree of reflux is assessed by measuring activity in the upper tracts after voiding.