Fresh and Frozen Embryo Transfers: An embryo transfer is the final step of the In Vitro Fertilization (IVF) process. During a fresh transfer, the embryo is transferred back into the uterus without ever being frozen. A frozen embryo transfer (FET) is a cycle in which frozen embryos from a previous IVF or donor egg cycle are thawed and then transferred.
The biggest benefits are indeed that the eggs have already been screened. Meaning that the genetic screening that occurs has already been done, you have knowledge of that. All the infectious disease screening that is done according to FDA guidance has already been completed, any type of urine drug screen has already been completed as well.
The history of egg donation began in 1983 when Australia reported the first known successful pregnancy using donated eggs. That same year, the United States completed its first successful egg donation transfer in Southern California, resulting in a healthy birth on February 3rd, 1984.