- October 20, 2017 at 10:19 #4004
Embryos that are cryopreserved during an IVF cycle can be replaced following a spontaneous ovulation (natural cycle) or the development of an “artificial” endometrium thanks to oestrogen and progesterone. Embryos are frozen using vitrification technology. Roughly 90% of those can survive the freeze/thaw process. When the embryo survives, the likelihood of their implantation is virtually like a fresh embryo transfer.
In fact, transferring embryos inside a frozen embryo transfer (FET), may be associated with a higher pregnancy rate than fresh transfers, suggesting the endometrium during a stimulated fresh IVF cycle might not be optimal for implantation. The primary benefit of a FET when compared with a medicated IVF cycle is the fact that there is no requirement for the surgical egg retrieval, no anesthesia, no gonadotropins, making FET much less involved and fewer costly. It is reassuring that there is no elevated chance of hereditary anomalies in infants born following the transfer of cryopreserved embryos.
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