Does the estradiol level on the day of human chorionic gonadotrophin administration have an impact on pregnancy rates in patients treated with rec-FSH/GnRH antagonist?

Abstract

E(2) concentrations on the day of hCG administration in GnRH antagonist cycles are not associated with pregnancy rates. A potential deleterious impact of estradiol on endometrial receptivity is shown for the high responders who have high E(2) levels and improved embryo quality without a concomitant rise in pregnancy rate.