Embryos not used in the current cycle is usually cryopreserved. Cryopreservation is usually attained with vitrification, a swift freezing course of action. Vitrification is believed to forestall cryoinjury by reducing the event of intracellular crystals.[35] All embryos may also be frozen in sufferers in danger for ovarian hyperstimulation syndrome (reviewed https://www.ivf.com.mx/