1. Loss of technical links
1. Limited thawing recovery rate
Evenwith advanced vitrification technology, the survival rate of eggs after thawing is about 90%, but the fertilization rate is only 60%-80%(higher in young women), and the proportion of embryos eventually formed is even lower.
Even if the embryos are successfully cultured, the risk of miscarriage remains.
Even if the embryo is successfully cultivated, the risk of miscarriage still exists.
● Under 35 years old: The fertilization rate after thawing of frozen eggs is about80%
● Over 35 years old: The rate of chromosome abnormalities in eggs increases, and the fertilization rate drops to 60%-70%

3. Other key influencing factors
1. Differences in freezingtechnology
Different institutional thawing protocols (such as cryoprotectant concentration and heating rate) directly affect egg integrity.
The thawing procedures used by different institutions (such as the concentration of cryoprotectants and the rate of temperature increase) directly affect the integrity of the eggs.
Laboratory operation specifications, embryo culture conditions, etc. determine the final number of available embryos.
The standardization of laboratory procedures and the conditions under which embryos are cultured determine the final number of viable embryos that can be obtained.
Endometrial receptivity, hormone levels, and immune problems all affect pregnancy outcomes.
The receptivity of the endometrium, hormone levels, and whether there are any immune issues can all affect the outcome of pregnancy.
● Data reference: A 30-year-old woman has 15 eggs frozen and 25 eggsfrozen
● Risk warning: Frozen eggs cannot reverse egg aging and may be accompanied by risks such as ovarian hyperstimulation syndrome (OHSS)
Conclusion: Frozen eggs is an effective means to preserve fertility, but the probability of pregnancy is limited by many factors such as age, technology, and health, and needs to be scientifically evaluated based on individual conditions.
:,,,,.It is recommended that those in need consult reproductive medicine experts as soon as possible to formulate personalized plans.