Eighty-one women suffering from occluded Fallopian tubes and 29 women with unexplained infertility were treated with in vitro fertilization and embryo transfer (IVF-ET). All procedures were carried out on outpatients. A total of 24 pregnancies were achieved in the group of patients with occluded tubes whereas eight became pregnant in the group of patients treated for unexplained infertility. From these results, it is expected that 30% of women suffering from occluded tubes or unexplained infertility can achieve pregnancy following two IVF-ET treatment cycles.