During the years 1976 to 1980, 178 laparoscopies with hydropertubations and 113 hysterosalpingographies as well as 24 combined tests were carried out at the University Clinic of Obstetrics and Gynecology Graz. Of these, 263 cases could be evaluated. On the basis of the diagnosis made by above mentioned examinations, a pregnancy was practically impossible for 102 women. Of the remaining 161 cases, 38 (23,6%) conceived within the first six cycles subsequent to "invasive diagnosis". It is assumed that these patient's pregnancies can be attributed directly to the diagnostic measures. It is presumed that the reason for this therapeutic effect lies in the removal of a mechanical or psychic disturbance.