GNRH1 and ovarian hyperstimulation syndrome: Additionally, the BEYOND study showed that using an individualized fixed-dose of follitropin delta in a GnRH agonist protocol is as effective as a GnRH antagonist protocol in European and Israeli women with AMH concentrations ≤35 pmol/L, resulting in a significantly higher number of oocytes retrieved and no increased risk of OHSS (12).