Today, mainly for social reasons, women are delaying their time to become mothers, reducing the possibility of conceiving naturally. The quality and quantity of the oocytes drops considerably after 35 years’ of age, reducing the probability of achieving a pregnancy. However, women can plan the time to become mothers thanks to vitrification, which allows them to freeze their oocytes for years. When a woman decides to become a mother they are thawed, and these oocytes preserve the quality they had when they were frozen.
The simple vitrifying procedure allows women to preserve their fertility. It consists in hormone stimulation and ovarian puncture to extract the eggs. Subsequently, in the laboratory they are stored at -196°C hasta until the decision is taken to use them. At present, oocytes can be frozen safely, with a survival rate of about 80-95%.