Objective: In compare the use of purified follicle-stimulating hormone with that of a preparation containing follicle-stimulating hormone and luteinizing hormone in infertile females undergoing IVF. Design: Open-labelled prospective controlled single-center study. Setting: Nile Badrawy IVF unit. Participants: 153 infertile females undergoing their first cycle of IVF divided into 2 groups. Interventions: Ovarian stimulation was done with either highly purified FSH for group 1 (n = 75) or human menopausal gonadotrophin group 2 (n = 78) after pituitary desensitization commenced in the midluteal phase of the preceding cycle. Monitoring was performed by ultrasound transvaginal oocyte retrieval followed by IVF and transfer of three embryos. Outcomes: Number of oocytes >18 mm at day of hCG, fertilization rate, embryo transfer rate, clinical pregnancy rate and incidence of ovarian hyperstimulation syndrome. Results: The response to ovarian hyperstimulation was similar in both groups. The number of follicles >18 mm achieved at day of hCG was 12.3 ± 0.9 (mean ± SEM) following stimulation with 38.3 ± 0.9 ampoules of Fostimon The Menogon-treated group needed 39.1 ± 0.8 ampoules to produce 11.6 ± 0.7 follicles. Fertilization rate (2PN/cell) was 58.6 vs. 64.2% in the Fostimon and Menogon group, respectively (p > 0.05). The number of embryos transferred per woman was 3.1 ± 0.1 in the Fostimon group and 3.6 ± 0.1 in the Menogon group. The pregnancy rate per woman was 33.3 vs. 25.6% in the Fostimon- and Menogon-treated groups, respectively (p > 0.05). Miscarriage rate was 16 vs 20%, respectively. However, the incidence of multiple pregnancies was significantly higher in the Fostimon-treated group (32%) vs. 10% only in the Menogon-treated group (p < 0.01). Conclusion: Purified FSH yields similar clinical outcome to hMG in terms of oocytes retrieved and clinical pregnancies in a standard IVF regimen.

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