Hereditary disturbance of hearing.

As 40-60% of all heredity disturbances are of genetic origin, it is necessary to apply complex human genetic methods in diagnosis and prevention. Formerly clinicogenetic examinations in most cases only implied the analyses of hereditary constitution. An observation as demonstrated through the examples of several kinships with hereditary disturbances of hearing may serve as a model of complex clinicogenetic investigations. In all cases the diagnosis of hereditary disturbances of hearing must be followed by human genetic family advice.