In vitro embryo freezing does not deteriorate in quality over time, so the quality is good even after 8 years of freezing.
Embryos are frozen in liquid nitrogen at an overall temperature of -196 degrees Celsius, and current theories suggest that embryo freezing can be preserved for a long time, so no matter how long the embryos are frozen, normal resuscitation and transfer after freezing will have little effect on the embryos, so it is generally believed that the quality of the embryos has nothing to do with the time of freezing.
However, it is important to note that the quality of embryos is mainly related to the changes that occur during the freezing and resuscitation of the embryos. If the embryos do not tolerate freezing or are damaged during resuscitation, the quality of the embryos will be affected.
For those who want to undergo IVF embryos, it is recommended that they visit the reproduction department of a regular hospital and be treated under the guidance of a doctor.