Egg freezing (also known as oocyte cryopreservation) is a recent scientific advance which allows woman the ability to freeze their eggs at a younger age whether for social or medical reasons. The egg freezing technique involves collecting eggs from the patient in the same way as if she was undergoing a cycle of IVF. The mature eggs are then frozen the same day. When pregnancy is desired, the eggs are thawed and fertilised via IntraCytoplasmic Sperm Injection (ICSI). Resulting embryos are then transferred to the uterus.