Cryopreservation refers to the cooling of cells and tissues to sub-zero temperatures in order to stop all biologic activity and preserve them for future use. This process can be used for a woman’s eggs to preserve them for future child-bearing. By utilizing the most advanced freezing technology available (vitrification or flash-freezing), we are now able to achieve egg survival rates of about 90%.
The process of egg freezing is identical to going through an IVF cycle with the exception of fertilization (combining the egg and sperm together to form an embryo). In the case of egg freezing, no sperm are required. As with most aspects of fertility treatment, success rates are based on the age of the woman. The younger a woman is when she freezes her eggs, the more chance she has for a successful pregnancy. In general, we recommend the collection of 9-10 eggs for every desired pregnancy.
The most common reasons a woman chooses to freeze her eggs include:
- Patients about to undergo treatment for cancer (radiation, chemotherapy)
- Benign conditions (i.e. endometriosis) which threaten the normal ovarian tissue
- Religious objections to the freezing of an embryo
- Failure to obtain sperm on the day of the egg retrieval
- Social reasons which include lack of a partner or delay of child-bearing for career purposes
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