Egg freezing, or oocyte cryopreservation, is a fertility preservation technique where a woman's eggs are retrieved, frozen, and stored for future use. This process allows women to delay childbearing while preserving their reproductive potential. It is often used by women undergoing cancer treatment, those with health conditions affecting fertility, or those simply wishing to delay pregnancy. The procedure involves hormone stimulation to mature multiple eggs, which are then collected and frozen. When a woman is ready to conceive, the eggs are thawed, fertilized through in vitro fertilization (IVF), and the resulting embryos are transferred to the uterus.

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