The inability of preovulatory ovarian scan to predict multifetal pregnancy occurrence in a follow-up of induction of ovulation with menotropins

Abstract

To establish the predictive role of preovulatory ovarian ultrasonography in the occurrence of multiple pregnancy after hMG and hCG treatment for anovulatory infertility. Prospective. Outpatient Infertility Clinic. Ninety-five anovulatory women who conceived after gonadotropin therapy. Induction of ovulation by hMG and hCG monitored by plasma E2 measurements and ovarian ultrasonography. All follicles visualized on the day of hCG administration were recorded and divided into the following four groups: group I, 10 to 12 mm; group II, 13 to 15 mm; group III, 16 to 18 mm; and group IV, 19 mm and larger. The sonographic findings were statistically evaluated to 80 singletons and 45 multiple pregnancies. No statistical correlation was found to exist between the number of follicles from the different groups and the number of fetuses. The number and sizes of follicles visualized on the day of hCG administration have no predictive value regarding the occurrence of a multiple pregnancy.