Egg cells are frozen on the day of their collection. Later, they can serve as a deposit before another in vitro procedure. The technique recommended for fertilization of thawed egg cells is ICSI. About 60-80% of normal egg cells survive the process of freezing and thawing.
Embryos can be frozen at various stages of their growth. They can be frozen on Day 2, 3 or 5 of their culture. Embryos are frozen provided that they have normal morphology..