Embryos not Employed in The present cycle is often cryopreserved. Cryopreservation is often achieved with vitrification, a rapid freezing process. Vitrification is thought to avoid cryoinjury by decreasing the development of intracellular crystals.[35] All embryos can be frozen in clients in danger for ovarian hyperstimulation syndrome (talked about more in https://www.ivf.com.mx/