Abstract: A system and a method is presented that includes monitoring in real time the position and movement of the head with regard to a visual stimulator during videonystagmography (VNG) or electronystagmography (ENG) studies in a patient. Ultrasound sensors and emitters are used combined with gyroscopes as gravity detectors, or other devices. The signals of the sensors are processed by software that carries out positioning monitoring that facilitates the operation of the operator and makes a quality control of the diagnostic maneuvers, thus providing a test reproducible method for patients. Reproducibility is ensured by means of acceptance limits provided by the software. The invention provides a way of ensuring the reproducibility according to ANSI standard in the tests by guiding the operators throughout the process so that they may conduct the tests in the same way for all patients. This inventive portable system can be use in any physician's office.