The protocols involving gonadotropin releasing hormone (GnRH)agonist (GnRH-a) have high rates of embryo implantation and clinical pregnancy. 1 Hence, these are the most commonly used controlled ovarian hyperstimulation (COH) protocols in China. However, the deficiencies of these schemes lead to an increase of ovarian hyperstimulation syndrome (OHSS) incidence). 2 In vitro maturation (IVM) is a simple, low-cost procedure that decreases the occurrence of OHSS. 3 Therefore, our center adopted a modified scheme including the timely switch from conventional in vitro fertilization (IVF) to IVM when patients undergoing COH
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