A long, thin, sterile, flexible or semi-rigid tube designed for connection to urodynamic measuring equipment for urodynamic examination of a patient. It is inserted into the bladder via the urethra or non-surgically via a stoma for cystometry, to drain the bladder to facilitate measurement of urinary output, and for urethral pressure and other urethral and voiding pressure examinations. It is available with various lumens (e.g., single, double, triple) providing one or more openings at the distal end, and is calibrated in increments to assist in positioning. It may be dedicated to a gas or water infusion technique. This is a single-use device.