GNRH1 and ovarian hyperstimulation syndrome: Lainas et al. [18] reported that low-dose luteal GnRH-ant administration in women with severe early OHSS is associated with significantly decreased ovarian volume, ascites, hematocrit, white blood cell count, serum estradiol and progesterone by the end of the day 11 post-oocyte retrieval, indicating rapid resolution of the severe OHSS.