Embryos not used in the current cycle is usually cryopreserved. Cryopreservation is typically accomplished with vitrification, a rapid freezing process. Vitrification is assumed to circumvent cryoinjury by decreasing the event of intracellular crystals.[35] All embryos may also be frozen in sufferers in danger for ovarian hyperstimulation syndrome (reviewed additional in https://www.ivf.com.mx/