Glossary · Definition · v2026.3
What Is Embryo Freezing?
Embryo freezing is the preservation of embryos using cryopreservation so they can be used in future IVF cycles.
How Embryo Freezing Works
Embryos are frozen using vitrification, an ultra-rapid freezing technique that prevents ice crystal formation. Vitrified embryos are stored in liquid nitrogen at minus 196 degrees Celsius. Survival rates after thawing exceed 95 percent in experienced laboratories. Embryos can remain frozen for years without measurable degradation in quality.
Why Embryo Freezing Matters
Freezing allows patients to preserve surplus embryos from a retrieval cycle for future use. Frozen embryo transfer cycles are medically simpler and less expensive than fresh retrieval cycles. Many clinics now prefer a freeze-all strategy, where all embryos are frozen after retrieval and transferred in a subsequent cycle, allowing the uterine environment to recover from stimulation medications.
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This content defines terminology for educational orientation. It does not constitute medical advice.
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