 1. Traditional backfill assisted voiding trial control: Backfill the bladder with up to 300 ml as tolerated of normal saline or sterile water through an indwelling Foley catheter. The catheter is removed and the patient is given 15 minutes to void and the voided volume is measured. A post void residual PVR is measured after voiding or attempt to void using either an in and out catheter or a bladder scanner. The participant is considered to have passed the void trial if they have a PVR of less than 100 mL or less than half the voided volume if voided volume is greater than 200 mL. 