Frozen Embryo Transfer & Cryopreservation
Often couples have excess embryos after an invitro fertilization (IVF) cycle that have been cryopreserved for future use. Embryo cryopreservation has become a routine practice within advanced reproductive technology (ART) clinics. The newer technology for embryo cryopreservation, called vitrification, has significantly improved the pregnancy outcomes achieved with frozen embryos compared to the older freezing methods. In fact, success rates with frozen embryo transfer cycles are now equal in success rates compared to fresh embryo transfer cycles.
During a frozen embryo transfer cycle, the uterus is prepared with both estrogen and progesterone hormones to make the uterus receptive. This hormonal preparation typically takes 3-4 weeks of time. During this 3-4 week time period, both hormone levels and the uterine lining are monitored to ensure optimal uterine receptivity. Cryopreserved embryos are then thawed and transferred back into the uterus. Approximately 95% of embryos typically will survive the freeze-thaw process. Pregnancy testing occurs 10 days after the embryo transfer.