Embryo Freezing also called Cryopreservation is a technique in which sperm or embryos are frozen in liquid nitrogen and stored for future use—with little or no effect to the viability of the specimen. During ART treatment, the embryos that are not used are frozen and stored in tanks. In addition to liquid nitrogen, a liquid called cryoprotectant is added to protect the eggs during the freezing process. Most freezing methods freeze the embryos down to -196 degrees Celsius. Frozen embryos can be stored typically up to 10 years.
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