[Cases of diseases registered with the Genetic Counseling Service during the past 20 years, in the light of their etiology].

The authors analyse the experiences of their Genetic Counseling Clinic between 1979-1992. They show the formation of the motives of presenting and consulting. They range the consultants in three etiological categories (genetical, teratological and clinical entities). The proportion of new consultants increased fourfold and this tendency documents unambiguously the claim of family planners for this very important medical service. The proportion of Mendelian disorders, mutagen risk and consanguinity are relatively continuous. Because of teratogen risk the rate of presenting decreased moderately. The proportion of consultants shows a definite increase of multifactorial frequent disorders, which they value as a favorable tendency. For decreasing of unjustified cases they suggest the necessity of pre-screening.