The participant will emerge from anesthesia under routine monitoring and will be transferred to the post-anesthesia care unit (PACU) when meeting appropriate criteria per anesthesia discretion. A staff PACU nurse will care for the participant in the PACU administer narcotic medications as necessary and/or per participant request. Once the participants are awake and meeting criteria for discharge, the patients in the backfill group will undergo a void trial by a PACU nurse or by a doctor if the nurse is unavailable. About 300 mL of fluid will be instilled into the bladder and the Foley will then be removed. The participant will be given up to 1 hour to urinate and the amount urinated will be recorded using a commode specimen collection measurer. The PVR will be measured using a bladder scanner. If the PVR is greater than 100 mL or if the patient is unable to void within the hour, the void trial will be considered "failed" and a Foley catheter will be replaced.