Embryo Cryopreservation involves the freezing of embryos created by IVF or ICSI. Your physician may recommend freezing embryos for several reasons. You may have extra embryos to save in case you are not pregnant or for an additional pregnancy attempt in the future. Not every woman will have extra embryos to freeze. You may also undergo IVF and have too large of a response (ovarian hyperstimulation) and your physician may recommend against placing embryos back in right away and that you instead freeze the embryos and place them at a later, safer time.
Embryos may stay frozen for a long time. Although not every frozen embryo will thaw properly at a later time, success rates are extremely high. If you freeze your embryos, it is important that you discuss with your physician how those embryos will be used in the future and how long you anticipate keeping them frozen.