IVF fresh and frozen embryos refer to IVF fresh embryo transfer and frozen embryo transfer. The success rate of IVF frozen embryo transfer is slightly higher than that of IVF fresh embryo transfer, but there are advantages and disadvantages to both, and the choice of frozen or fresh embryo needs to be considered based on the woman’s health and other factors. The advantages of IVF fresh embryo transfer are that it shortens the time to pregnancy and eliminates the costs associated with freezing and thawing embryos, and it is preferred for patients who are suitable for fresh embryo transfer. Frozen embryos allow for better timing of transfer. If a woman acquires too many eggs at the time of egg retrieval due to the use of hormones, resulting in ovarian hyperstimulation syndrome, the hormonal status at the time of egg retrieval is not suitable for embryo transfer, or if she has other medical conditions that need to be addressed, the embryos need to be frozen and preserved. Waiting for the woman’s body and uterus to be in the best condition before transferring, when the embryos are in a good environment for implantation and development, can help improve the success rate of IVF. For infertile couples who need pre-transfer embryo genetic testing, frozen embryos need to be preserved pending embryo test results. Therefore, the choice of fresh or frozen embryo transfer needs to be determined on a case-by-case basis.