Embryos not used in the current cycle can be cryopreserved. Cryopreservation is often reached with vitrification, a rapid freezing process. Vitrification is assumed to forestall cryoinjury by lowering the development of intracellular crystals.[35] All embryos will also be frozen in sufferers in danger for ovarian hyperstimulation syndrome (reviewed additional in https://www.ivf.com.mx/