*Loosen any pigtail
*Insert a guidewire (such as Amplatz) into the renal pelvis or proximal ureter.* <br>''[[#Troubleshooting|Troubleshooting: Cannot advance guidewire]]''
*Remove the previous catheter while keeping the guidewire in place<ref group="notes">Always keep at least one hand on the guidewire. The grip needs to be switched to just above the skin as the catheter tip exits.</ref>.* <br>''[[#Troubleshooting|Troubleshooting: Catheter stuck]]''
===Insertion of new catheter===