GNRH1 and ovarian hyperstimulation syndrome: Among the advantages of using GnRH agonists compared to hCG, we find the reduced risk of OHSS (Kol, 2004), a more physiological LH and FSH surge, which may result in improved oocyte (Humaidan et al., 2005) and endometrial quality (Forman et al., 1998; Simon et al., 1998).