How Long Do Embryos Take To Thaw. Blastocyst transfer takes place on day 5. Normally, the embryos are taken out of storage only a short while before they are going to be replaced.

This can vary depending on what stage of development the embryos were at when they were frozen and the effect freezing may have on different embryos. The process of thawing an embryo after cryopreservation has a relatively high success rate, and research suggests that women who use thawed embryos have good chances of delivering healthy babies. Embryos thaw to room temperature within less than a minute or two after being removed from cryostorage, but the entire thaw process takes about 40 minutes before the embryo is ready for transfer or further incubation.