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Cryopreservation of Embryos

Embryo Cryopreservation

Cryopreservation is often done when there are more embryos than needed for a single in vitro fertilization, IVF cycle. The extra embryos are saved and potentially used during later cycles.

IVF success rates are generally lower with frozen embryos than with freshly fertilized embryos, but pregnancy rates with frozen embryos have been improving in recent years. The survival rate after thawing often depends on the quality of the embryos at the time of freezing.