Indirect radionuclide cystogram (IRC) can be performed as a supplement to a standard MAG3 scan in toilet-trained children. At the end of the MAG3 scan the bladder contains the secreted radionuclide mixed with urine. Images are obtained as the child voids, and an objective assessment of bladder emptying can be made. Any vesicoureteric reflux (VUR) of MAG3 from the bladder to the kidneys can also be identified. Although not as sensitive for the detection of VUR as direct forms of cystography (DRC, MCUG, cystosonography), the need for bladder catheterisation is avoided.