Frozen embryo transfer is the transfer of the embryo back into the uterus, not the ovulation and egg collection cycle. Usually, they are transferred the next month after preparation of the uterus. The embryos are frozen and stored before being thawed for transfer to the uterine cavity.

The advantages of frozen cycle embryo transfer are as follows:

• Able to prepare the uterus for embryo transfer
• Able to Chromosome Test (NGS) to find genetic abnormalities
• Able to reduce the problem of ovarian hyperstimulation

Therefore, frozen embryo transfer has a high chance of pregnancy success.