In the present article authors argue about the necessity of application of audiometric method in the expanded range of frequencies in a complex of audiologic methods of the research, that allow to test acoustical sensitivity to high-pitch tones (12.0– 20.0 kHz) in patients with various forms of relative deafness. It is established that at these high frequencies the earliest preclinical signs of relative deafness are found. As a result of the use of the given research method in connection with audiologic methods authors have revealed early forms of relative deafness at the surveyed patients. It has allowed to conduct the timely adequate therapy, that finally warns invalidation of the patient on a hearing condition.