Embryo freezing is a procedure that allows people to store embryos for later use.
Fertility treatments such as IVF often generate more embryos than are needed for the treatment. You may be advised to freeze them for future use.
Embryos can be frozen at various stages of their development- day 1, called the pronuclear stage, day 2/3, called the cell stage, or day 5/6, called the blastocyst stage. More than 70% of embryos survive the thawing process. The embryos are usually stored for a period of 10 years.