Deferred Versus Fresh Embryo Transfers

"Women randomized in the non experimental group will have:~* Antagonist stimulation protocol~* Ovarian triggering using a single injection of rhCG (Ovitrelle®; Serono, France)~* All of their embryo kept in prolonged culture~* A fresh single embryo transfer at blastocyst stage (on day 5 or 6 according to blastocyst stage)~* Supernumerary blastocysts cryopreserved"

"Women randomized in the experimental group will have:~* Antagonist stimulation protocol~* Ovarian triggering using a single injection of 0.2 mg of GnRH agonist triptorelin (Decapeptyl® Ipsen France)~* All of their embryo cryopreserved at the blastocyst stage after prolonged embryo culture.~* A frozen-thawed single embryo transfer at blastocyst stage, is planned 3-11 weeks after cryopreservation"