A frozen embryo transfer is used to achieve a pregnancy by first thawing frozen embryos and then transferring those that have survived the thawing into the uterus.
After the thawing process the temperature of the frozen embryos will go back to an appropriate level allowing them to continue developing normally. Viable embryos will be transferred into the uterus. Approx. 70% of the embryos survive the thawing, i.e. they are able to start cell division again.
In a frozen embryo transfer the woman will undergo a hormonal replacement therapy to prepare her endometrium and make the embryo implantation easier. Compared to an IVF treatment a frozen embryo transfer is more simple and less lasting (generally no injections are used) and requires less ultrasound and blood testing. Moreover the thawing and the transfer can be planned beforehand.
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