After having described the bases of dactyloscopy, the authors report on the clinical importance of this method in gynecology and obstetrics. Own results about Turner's syndrome and first experiences of the dactyloscopic examination of mothers of malformed infants are discussed. The patients with XO Turner's syndrome in our series have a ridge count of 181, comparable to the value of 178, 6 observed by Penrose. Mothers of infants with congenital malformations have no different dactyloscopic features in comparison with the controls.