An ambulatory urodynamic data gathering system includes one or more sensors disposed in the gastrointestinal tract, a sensor disposed in the bladder, a sensor disposed at the entrance to the urethra, and a data recorder worn by the patient that is disposed around the patient's waist. The sensors transmit data to the recorder unit, which stores the received data for subsequent analysis. The recorder unit also activates the various sensors as necessary to obtain information at certain predetermined intervals to limit battery usage. The recorder unit can also interrogate the various sensors to obtain the information. In one exemplary embodiment, the ambulatory urodynamic data gathering system includes a method and device for simultaneously recording radio transmitted pressure measurements from a swallowed self-contained capsule (pressure monitor, signal processing, transmitter, power source or coupling antenna), and a self-contained unit placed in the bladder, for the purpose of deriving urodynamic information. The system of the present invention enables collection of pressure wave information above the waist of the patient so that a doctor can subsequently analyze the data to determine where the problem may lie.