Shiping Chen1, Yachao Yao2, Yang Luo1, Yuling Mao1, Hanyan Liu1, Hongzi Du1, Xiangjin Kang3, Lei Li4,5,6,7. 1. Center for Reproductive Medicine, The Third Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510150, China. 2. Department of Clinical Laboratory Medicine, Guangdong Second Provincial General Hospital, Guangzhou, 510317, China. 3. Center for Reproductive Medicine, The Third Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510150, China. kangxiangjin@163.com. 4. Center for Reproductive Medicine, The Third Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510150, China. lileigo@foxmail.com. 5. Key Laboratory for Reproductive Medicine of Guangdong Province, Guangzhou, 510150, China. lileigo@foxmail.com. 6. Key Laboratory for Major Obstetric Diseases of Guangdong Province, Guangzhou, 510150, China. lileigo@foxmail.com. 7. Key Laboratory of Reproduction and Genetics of Guangdong Higher Education Institutes, Guangzhou, 510150, China. lileigo@foxmail.com.
Abstract
PURPOSE: To identify the optimal time for the frozen embryo transfer (FET) after oocyte retrieval in freeze-all cycles. METHODS: A retrospective analysis of 977 patients was performed. Implantation, clinical pregnancy and live birth rates were analyzed. RESULTS: No significant difference was found between the first FET performed in the first menstrual cycle group and performed within the subsequent menstrual cycle group in terms of implantation, pregnancy and live birth rates. To rule out the effect of endometrial thickness, a hierarchical analysis was performed. There were no differences between groups for pregnancy, multiple pregnancy and live birth rates for all ranges of endometrial thickness. CONCLUSIONS: The first FET should be performed once the endometrial thickness has been prepared well rather than delaying until the subsequent menstrual cycles.
PURPOSE: To identify the optimal time for the frozen embryo transfer (FET) after oocyte retrieval in freeze-all cycles. METHODS: A retrospective analysis of 977 patients was performed. Implantation, clinical pregnancy and live birth rates were analyzed. RESULTS: No significant difference was found between the first FET performed in the first menstrual cycle group and performed within the subsequent menstrual cycle group in terms of implantation, pregnancy and live birth rates. To rule out the effect of endometrial thickness, a hierarchical analysis was performed. There were no differences between groups for pregnancy, multiple pregnancy and live birth rates for all ranges of endometrial thickness. CONCLUSIONS: The first FET should be performed once the endometrial thickness has been prepared well rather than delaying until the subsequent menstrual cycles.
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