5/1/2023 0 Comments Fet cycle timelinePrior to this any embryos created through IVF that were not used were discarded. The techniques involved in embryo cryopreservation were pioneered here in Australia in the mid 1980’s. At Fertility Solutions cryopreservation is routinely used to store sperm and embryos, and more recently human eggs. Therefore, if a vitrified blastocyst embryo can be transferred into the uterus during a natural cycle, a patient’s chance of success is as good, if not better than their chance of pregnancy during a fresh stimulated IVF cycle.Ĭryopreservation is a term used to describe thee freezing of biological material for future use. This is most likely due to the changes in the endometrium (uterine lining) that occur during the stimulation process in an IVF cycle. In addition, recent studies are suggesting that FET cycles may yield a higher pregnancy rate than their fresh counterparts. On average, it is expected that approximately 85-90% of vitrified embryos will survive the freezing and thawing process. Due to scientific improvements in the techniques associated with freezing embryos, namely vitrification, embryos can be frozen (or vitrified) with very reliable recovery and survival rates. When a frozen embryo transfer (FET) treatment cycle is initiated patients and are not exposed to further stimulated cycles unnecessarily. In a fresh stimulated IVF cycle, excess embryos that reach a suitable blastocyst stage by day 5/6 are frozen and are available to be used in a subsequent Frozen Embryo Transfer (FET) cycle.
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