Overview Estrogen Pretreatment Prior to GnRH Antagonist Protocol Status: Completed Trial end date: 2011-05-01 Target enrollment: Participant gender: Summary The purpose of this study is to assess whether estrogen pre-treatment can allow retrieval of 2 additional oocytes in GnRH antagonist protocol. Phase: Phase 4 Details Lead Sponsor: GemerTreatments: EstradiolEstradiol 17 beta-cypionateEstradiol 3-benzoateEstradiol valerateEstrogensPolyestradiol phosphate