Often, more embryos are created in the same cycle than will be transferred. All good quality embryos are vitrified and preserved for the woman/couple so that they can be used in the future.
Through cryo transfer of own embryos, supernumerary embryos created from a previous treatment of any kind are used: IVF, egg donation or embryo donation.
Cryopreserved embryos are frozen in liquid nitrogen at -196 degrees Celsius. With the transfer of frozen embryos there are more chances of pregnancy without the need for another assisted reproductive treatment from scratch.
That is, without having to perform a new ovarian stimulation. Only the endometrium of the woman who will receive the embryos must be prepared for implantation.
The endometrium must be prepared for about 10 to 15 days. In the meantime, the woman must undergo a series of ultrasounds to check that the endometrium is ready. This means that it must be at least 6 mm thick in order to be able to schedule the day of the transfer.
The embryos are usually thawed a few hours before the day of the transfer. This takes place in the operating room through a cannula, without the use of anesthesia.
At the end, the patient must rest for about 15 minutes and then can lead a normal life. Finally, 2 weeks after the embryo transfer, the woman undergoes a beta blood test to verify the positive result of the pregnancy.
Preguntas frecuentes
- What happens to the embryos when they do not want to be frozen any longer? Once the woman has finished her reproductive cycle, couples or single women have 3 options as destination of their frozen embryos: donate them to other couples or single women, donate them to science for research or thaw them.
- Is there a limit to the number of times I can transfer my own frozen embryos? The limit is the number of vitrified embryos that the couple or single woman has available.
- In what cases is a frozen embryo transfer performed? In the case of receiving donated embryos or having frozen embryos from a previous cycle.
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