During the medical fertilization process, more embryos are developed than required - more than can be used the first time. As a fail-safe measure, should the first attempt not be successful then the embryos can be frozen. This quick-freeze method provides a much higher chance of embryo survival than slow freezing (which contributes to crystal formation in embryo cell cytoplasm). Only good quality embryos with the potential for future development are vitrified. So the embryo transfer can be repeated during the next cycle, avoiding the need to repeat the hormonal stimulation for the receipt of fertilized eggs. Latvian legislation allows for embryos to be stored for 10 years.
