The clinical value of a technique using suprapubic catheters prevesically and intravesically for detrusor pressure recordings is analysed. The method has been used in 143 investigations including both males and females. The complication rate is low, 2.8%, and the advantages of a well defined measuring level and identical measuring systems for all pressure recordings are stressed. It is also concluded that there seems to be no risk of infection. For repeated investigations, such as when, for instance a second postoperative urodynamic check is wanted, this technique does not involve any drawbacks due to surgical trauma. The technique with two suprapubic catheters is well accepted by the patients and is preferred to rectal catheters by volunteers who have tried both types.