“…Since in most EFS cases, down-regulation was achieved by GnRH agonist (possibly presenting the higher prevalence of agonist over antagonist in ART cycles), shifting from an agonist to antagonist protocol was suggested (Krishna et al, 2008). In cases where no oocytes are aspirated from one ovary and hCG levels are low, some have suggested readministering hCG from a different batch and aspirating the second ovary (Khalaf and Braude, 1997;Ndukwe et al, 1997;Awonuga et al, 1998;Quintans et al, 1998;Evbuomwan et al, 1999;Esposito and Patrizio, 2000;Papier et al, 2000;Reichman et al, 2010) or even reaspirating the same follicles (Meniru and Craft, 1997;Hassan et al, 1998;Snaifer et al, 2008). Others suggested changing the hCG from a urinary to a recombinant preparation (Peñarrubia et al, 1999).…”