Urodynamics and urodynamic study is a test to know the functioning of the lower urinary tract, ie as stored and eliminates urine. It is used to diagnose pathologies such as urinary incontinence, neurological disease affecting the urinary tract, urinary tract infections, etc. The test consists of several parts. First, the patient must urinate into a container called a flow meter, which measures the amount and speed of urine. After a probe is placed through the urethra using a numbing gel that reaches the bladder, which is used to measure the pressure and fill it with sterile physiological saline. Finally, the patient must urinate around the tube, which is then withdrawn. This is a total which lasts about 30 minutes simple procedure.