Follicular growth and oocyte maturation in GnRH agonist and antagonist protocols for<i>in vitro</i>fertilisation and embryo transfer

Abstract

Better follicular growth and oocyte maturation are achieved with GnRH agonist treatment. However, both regimens seem to have similar efficacy in terms of implantation and pregnancy rates. Further studies clarifying the effect of the GnRH antagonist on ovarian function are needed, as well as a clear definition of the best period of the follicular phase for the GnRH antagonist administration.