The serum oestradiol/progesterone ratio on the day of OPU + 7, but not the day of OPU + 5, affects the rates of live birth in fresh blastocyst embryo transfer cycles.

Zhao W, Diao H, Chen X, Xu S, Jiang S, Cao H, Zhang C, Zhang Y. The serum oestradiol/progesterone ratio on the day of OPU + 7, but not the day of OPU + 5, affects the rates of live birth in fresh blastocyst embryo transfer cycles. J Ovarian Res. 2023;16(1):4.