What is cryopreservation? Is it recommended?
– Embryos that are not transferred can be frozen. Freezing can be recommended for any high quality embryos that survive to the blast cyst stage. These embryos are stored in liquid nitrogen and can be thawed at a later stage. While the pregnancy rates with frozen embryos are not as high, the procedures involved in preparing for a frozen embryo transfer are much simpler and less expensive. Freezing only embryos that survive to the blast cyst stage maximizes the chance for success in a thaw cycle.
