Pergoveris® 150 I.U./75 I.U. is used to stimulate the development of follicles in the ovaries and was granted European marketing authorization in 2007. It consists of a fixed combination of recombinant human follicle-stimulating hormone (r-hFSH) and recombinant human luteinizing hormone (r-hLH) and allows the administration of both substances in a single injection. So far, no study has been performed to demonstrate the equivalence of Pergoveris® in the GnRH antagonist protocol as compared to the long protocol based on a GnRH agonist.