Inclusion Criteria:  Women between the ages of 18 and 80 years old, inclusive. Implanted with a neurostimulation device for at least 3 months prior to consent (Medtronic Interstim neurostimulator models 3023, 3058, 97810, or similar). Implanted with a tined lead that is placed and functionable at the pudendal nerve (Medtronic model 3889 or similar). Is capable of understanding clinical study procedures and giving informed consent. Willing and able to visit the clinic for the UDT evaluation (study procedure)  Exclusion Criteria:  Medically unstable at time of study and unsafe to undergo urodynamic testing as determined by the investigator. History of bladder cancer. History of pelvic radiotherapy. Active gross hematuria. Active symptomatic urinary tract infection (UTI) Active symptomatic uncontrolled bladder instability as determined by the investigator. History or symptoms of cystocele, enterocele, or rectocele of grade 3 or 4. Per the medical record or as determined by the investigator. Presence of an artificial urinary sphincter.