Fresh embryo transfer refers to the process of transferring newly fertilized embryos into the uterus of the female partner shortly after egg retrieval. The embryos are typically transferred within 3 to 5 days of fertilization when they are in the early stages of development.
Frozen embryo transfer, on the other hand, involves freezing the embryos that were created during egg retrieval and storing them in a specialized facility. These frozen embryos can be thawed and transferred into the uterus at a later time. This approach is often used for couples who want to undergo multiple embryo transfer procedures, or for those who want to preserve their embryos for future use. It may also be used in cases where the female partner needs to postpone embryo transfer due to medical treatment or other personal reasons.