An extensive urodynamic analysis can take up to 1.5 hours. A narrow measuring catheter is inserted into the urethra and the rectum, and the bladder is filled with a mixture of saline and contrast medium. Measuring probes register the reaction of the bladder, the strength of the bladder muscles, and the coordination of muscle-nerve-activity in both the storing and releasing phase. The results can provide information vital to determining the correct diagnosis and treatment of diseases. Examinations are done on an outpatient basis.