CPT® Code 0357T

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Cryopreservation of immature oocyte(s) is a specialized procedure aimed at preserving a woman's fertility, particularly when she faces the risk of losing ovarian function due to medical treatments such as chemotherapy or radiation therapy for cancer. This process involves the collection of immature oocytes, which are the early developmental forms of eggs, from the ovaries. These oocytes are typically harvested during a separate surgical procedure, either from excised ovarian tissue or through aspiration from antral follicles, which are small fluid-filled sacs in the ovaries that contain the immature eggs. Notably, this collection does not necessitate hormone stimulation, making it a viable option for patients who may not be able to undergo traditional ovarian stimulation protocols. Once harvested, the immature oocytes are evaluated for quality, and a series of cryoprotectant solutions, specifically designed for oocyte preservation, are prepared. The cryopreservation process can utilize different techniques, including the traditional slow freezing method and the more contemporary vitrification method. In the slow freezing method, oocytes are gradually cooled through a series of solutions with increasing concentrations of cryoprotectant, ultimately reaching extremely low temperatures. In contrast, vitrification employs a high concentration of cryoprotectant to achieve a rapid freezing process that results in a glass-like state, preventing the formation of ice crystals that can damage the oocytes. After freezing, the oocytes are securely stored in labeled straws or vials, ensuring proper identification and traceability until they are required for future assisted reproduction procedures.