Embryos not used in The existing cycle is usually cryopreserved. Cryopreservation is typically attained with vitrification, a fast freezing method. Vitrification is believed to stop cryoinjury by decreasing the event of intracellular crystals.[35] All embryos can even be frozen in people in danger for ovarian hyperstimulation syndrome (mentioned additional in https://www.ivf.com.mx/