Embryos not Utilized in The existing cycle can be cryopreserved. Cryopreservation is often achieved with vitrification, a fast freezing method. Vitrification is believed to prevent cryoinjury by decreasing the event of intracellular crystals.[35] All embryos can also be frozen in clients in danger for ovarian hyperstimulation syndrome (reviewed more in https://www.ivf.com.mx/