• Patients who prefer to use frozen embryos obtained from a previous treatment cycle,

• Patients whose embryos were frozen due to hyperstimulation risk or unsuitable uterine conditions for transfer,

• Situations based on clinical choice,

• Those who are in the process of accumulating embryos (embryo pooling) for genetic testing or other reasons.

In a normal IVF cycle, developing eggs and the hormonal changes they induce prepare the uterus for transfer. However, in frozen embryo transfer, since this process does not occur, the patient prepares the uterus either through natural ovulation or more commonly with the help of hormonal medications. Once the “age” of the embryo and the uterus is synchronized, the thawed embryos are transferred to this uterus.

Frozen Embryo Transfer is the process of freezing embryos that are created during in vitro fertilization (IVF) treatment and later transferring them to the uterus. This method is used in cases where the embryos are not suitable for fresh transfer for medical reasons, or for couples planning to have children in the future. The frozen embryos can be stored at -196°C in liquid nitrogen for long periods and can be thawed and transferred to the uterus at a later date.