In view of the current debate concerning possible differences in efficacy between the two GnRH analogues, the current study aimed to explore whether progesterone control in the late follicular phase differs when GnRH-agonist is used as compared to GnRH-antagonist and if so to what extend does the progesterone rise have an impact on the probability of achieving a pregnancy.
The aim is to explore whether the incidence of progesterone rise in the late follicular phase differs between GnRH-agonist and GnRH-antagonist protocols for IVF and whether this has an impact on the probability of pregnancy achievement.