In the IVF cycle, the process that needs to be experienced is relatively long, and every link needs to be treated carefully, and it is generally best to choose the transfer when the blastocyst matures, but some people are told that it is not suitable for transplantation now when they are evaluated before transplantation, and they need to freeze the blastocyst and then transplant it after the body is well conditioned in the later stage. How long can it be frozen?
1. Why do you need to freeze blastocysts for test tubes?
1.Before blastocyst transfer, the uterine environment needs to be evaluated, and if the uterine environment is not ideal, such as not reaching the standard endometrial thickness of 8-12mm for transplantation, then the patient needs to undergo physical conditioning.
2.After ovulation induction, the mother suddenly feels unwell, such as cold, fever and cough.
3.In the process of ovulation induction, the use of drugs has a certain stimulating effect on the ovaries, and due to the different physical conditions of each person, some people may have the manifestation of ovarian hyperstimulation syndrome, which takes a certain amount of time to recover before transplantation.
2. How long can frozen blastocysts in vitro be frozen?
Blastocyst freezing time for 1 year, 5 years, 10 years or even longer, after thawing, there is no difference in its vitality, health and fresh blastocysts, there is no data to show that there is a difference in the success rate of frozen embryos and fresh embryo transfer, frozen blastocysts are more conducive to eugenics and fertility to a certain extent.
3. Will the success rate of IVF blastocyst freezing be reduced?
The current blastocyst preservation method uses vitrification, which is so fast that the moisture in the embryo does not have time to form ice crystals without causing any damage to the cells and viability of the embryo. After freezing, the embryos are stored in liquid nitrogen-196, at such a very low temperature, the embryonic cells do not undergo any activity, which is equivalent to pressing the pause button on embryonic development, so that the embryo will remain young forever.
Freezing embryos not only does not reduce the quality of embryos, but can better preserve embryos and prolong the service life of embryos. Moreover, a large number of cases have proved that the success rate of frozen embryo transfer is comparable to that of fresh embryo transfer, and sometimes even slightly higher than that of fresh embryo transfer.
The above also explains why to freeze blastocysts in IVF, if the physical condition does not allow after egg retrieval, it is the best choice to choose frozen blastocysts, if you choose to transfer in poor health, then the success rate of IVF will be reduced.