When we talk about the preservation of female fertility, we are referring to the possibility of vitrifying the eggs (freezing them) for later use. There are several reasons for wanting to preserve fertility:
Women who are going to undergo treatments which could jeopardize their oocyte quality, women with a low ovarian reserve, etc.
Women who, for different reasons, decide to postpone their motherhood. It should be noted that female fertility decreases significantly after 35 years of age.
As a result of the advances made in research on this technique, egg vitrification offers the same outcomes as treatments that use fresh eggs, inasmuch as 90% of the eggs survive devitrification.