Embryos not Employed in the current cycle may be cryopreserved. Cryopreservation is typically obtained with vitrification, a swift freezing method. Vitrification is believed to prevent cryoinjury by reducing the event of intracellular crystals.[35] All embryos will also be frozen in patients at risk for ovarian hyperstimulation syndrome (mentioned even more https://www.ivf.com.mx/