Cryopreservation or Embryo freezing, is the process of preserving embryos before cooling them to very low temperatures. Cooling is done in the laboratory using specialized freezing equipment and then stored in liquid nitrogen for long periods.
When to opt for embryo freezing?
The goal of this process is to have frozen embryos that can be thawed and transferred to a woman’s uterus for future use, without having to stimulate the ovaries to produce eggs. One may consider it if one wants to use embryos in future IVF and ICSI cycles, one is undergoing medical treatment that may potentially affect the fertility, one’s health is at risk and wants to freeze embryos with their partner or when one wants to freeze the embryos before undergoing sex change operation.
Embryo freezing is increasingly becoming more and more comparable to success rates of using fresh embryos. According to studies, for women over 35 with high progesterone levels, frozen embryo transfers were 73% more likely to be successful than a fresh transfer.