![]() ![]() The predetermined primary outcome was the biochemical pregnancy rate while the secondary outcome included the clinical pregnancy rate and the ongoing pregnancy rate. The patients began progesterone treatment 48 h before embryo transfer, regardless of identification of the LH surge if ovulation had not commenced. After meeting the predetermined criteria, embryo transfer was scheduled. The patients were monitored for endometrial growth, follicle formation and estradiol, progesterone, and LH hormone levels. We wanted to ascertain whether a modified natural protocol for frozen embryo transfer without triggered ovulation but with luteal progesterone support disconnecting the timing of embryo transfer from the timing of the LH surge can achieve a high pregnancy rate.Ĭandidates for frozen embryo transfer of 48-h cleavage cell embryos were recruited from May 2016 to April 2018. ![]() There have been conflicting results with this protocol and modifications may be sought. Electronic address: natural cycles for frozen embryo transfer utilize an ovulation trigger which assists in embryo transfer scheduling and simplifies cycle monitoring. Electronic address: 6 Fertility Unit, Department of Obstetrics and Gynecology, Emek Medical Center, Afula, 1834111, Israel. Electronic address: 5 Fertility Unit, Department of Obstetrics and Gynecology, Emek Medical Center, Afula, 1834111, Israel Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa, 3525433, Israel. Electronic address: 4 Fertility Unit, Department of Obstetrics and Gynecology, Emek Medical Center, Afula, 1834111, Israel. Electronic address: 3 Fertility Unit, Department of Obstetrics and Gynecology, Emek Medical Center, Afula, 1834111, Israel. Electronic address: 2 Fertility Unit, Department of Obstetrics and Gynecology, Emek Medical Center, Afula, 1834111, Israel. Electronic address: 1 Fertility Unit, Department of Obstetrics and Gynecology, Emek Medical Center, Afula, 1834111, Israel Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa, 3525433, Israel. 1 Fertility Unit, Department of Obstetrics and Gynecology, Emek Medical Center, Afula, 1834111, Israel Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa, 3525433, Israel. ![]()
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