Vitrification is the most modern method of freezing and preserving eggs and embryos for their later use. During vitrification, cells are frozen very quickly, 7,000 times faster than during cryopreservation. Such a speed prevents the formation of ice crystals, which could damage the cells.
We mainly use vitrification to freeze blastocysts and unfertilized eggs, because the results of this technique are significantly better than the classic cryopreservation. The success rate of defrosting the cells after vitrification is 95 %.