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Embryo freezing, also known as cryopreservation of embryos, is a medical technique to maintain embryos in a cold temperature for future use. After embryos are created through in vitro fertilization, they can be stored in a cold temperature at -196 degrees Celsius using liquid nitrogen.
Embryo freezing is done because of several indications:
- Patient’s condition is not yet optimal for the embryo transfer procedure (medical indications such as preventing OHSS, suboptimal hormonal conditions, and thin endometrial thickness)
- Excess of embryos with good quality during the IVF program
- Patients are undergoing PGT-A/PGTM program
Embryo freezing with vitrification technique is a relatively safe and effective technique, because embryos are stored in a very low temperature, the cells in the embryos are inactive and almost do not experience damage during the freezing and storage process.