In many cases, after the embryo transfer, there are excess embryos of good quality. Embryo cryopreservation gives the option to the couples to keep these embryos for future treatment cycles. In treatment cycles with cryopreserved embryos, the women do not have to go through ovarian stimulation and oocyte collection.
During the cryopreservation process the embryos are sequentially placed in media containing cryoprotecting agents, positioned in special devices labeled by the identification code, name of the woman and date of cryopreservation and stored in tanks with liquid nitrogen. In our Unit we use the method of vitrification for embryo cryopreservation.
When a couple decides to use their cryopreserved embryos, the embryos will go through the process of thawing and the best embryos will be chosen for embryo transfer.