Embryos not used in The present cycle is often cryopreserved. Cryopreservation is usually obtained with vitrification, a fast freezing approach. Vitrification is assumed to prevent cryoinjury by decreasing the event of intracellular crystals.[35] All embryos can even be frozen in people in danger for ovarian hyperstimulation syndrome (reviewed more in https://www.ivf.com.mx/