الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Several GnRH antagonist protocols are currently used during controlled ovarian stimulation which is defined as pharmacological treatment in which women are stimulated to induce the development of multiple ovarian follicles to obtain multiple oocytes at follicular aspiration.
Hormonal pretreatment modalities are used to suppress a patient’s endogenous gonadotropin secretion, thereby promoting the coordinated growth of early antral follicles in response to exogenous gonadotropins. The resulting synchronization of follicles has shown to increase oocyte and embryo yield and therefore, the overall chances of pregnancy.
Both oral contraceptive pills and estradiol valerate have been used to schedule a gonadotropin-releasing hormone antagonist in vitro fertilization cycles. This schedule makes it easy for stimulation and laboratory activities and prevents weekend oocyte retrieval