Although some metabolites are present in self-spent culture medium, there are some embryonic exocrine factors secreted by embryo.These factors may have a positive impact on embryo implantation and subsequent development. So it is necessary to compare the two ways of embryo transfer with Self-spent Culture Medium or New Culture Medium in vitro fertilization - embryo transfer process.~The purpose of this study is to analyze which way can improve clinical pregnancy and birth outcomes, is there a significant difference between the two?
Embryo Transfer With Self-spent Culture Medium or new Culture Medium in Vitro Fertilization - Embryo Transfer Process, to analyze which way can improve clinical pregnancy outcomes, is there a significant difference between the two?