E2 given in late luteal phase can be extended beyond the onset of menses for a period of at least eight days before the start of the stimulation, allowing scheduling of stimulation in order to limit oocytes retrievals during weekends . Administration of corifollitropin alfa, a Follicule stimulating Hormone (FSH) with extended release kinetics, seems particularly interesting for a synchronous recruitment of follicles after homogenization of the cohort. The objective of this study is to evaluate the impact on the response to ovarian stimulation with corifollitropin alfa of E2 scheduling versus no scheduling for women over 38 years, age at which declining of ovarian reserve usually begins. The management of these patients in terms of organization of the center is also evaluated. The scheduling of IVF cycles represents a double benefit. On one hand, to enable a "synchronization" of the follicular cohort for a best response and a higher number of mature oocytes. On the other hand, a more efficient organization for both the center (avoiding retrievals on weekends and public holidays, organize and distribute equally the activity, reduce cost operations) and couples (personal and professional organization).
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Number of selected oocytes
Timeframe: At time of ovarian puncture