Ultrasonic dopplerographic investigation (Ultramark-9, USA) was made in 227 males. 50 males with normal erection served controls. Stimulation of erection with an individual LOD-device is a low-invasive, convenient to standardize technique in ultrasonic dopplerographic examination of penile vessels for diagnosis of erectile dysfunction. Erection stimulation by different methods in the same patient during penile vessel dopplerography raises diagnostic value of this method.