Blastocyst Transfer

A blastocyst is an embryo that has developed for at least five days after fertilization — the point at which, during natural conception, embryos arrive in the uterus.

Prior to developments in IVF over the last decade, embryos were routinely transferred back to the uterus just three days after fertilization in the embryology lab.

But in a natural conception, the embryos arrive in the uterus approximately two to three days later. It was not until recent years that advancements in laboratory techniques allowed embryologists to mature the embryos further.  

By delaying the blastocyst transfer a few extra days, fertility specialists are much better able to select the embryos which have the best chance for survival.  

In turn, by growing embryos to a more advanced stage, fertility physicians are able to transfer fewer embryos without decreasing the chance for pregnancy. This advancement maintains a high pregnancy rate while decreasing the risk of conceiving a high-order multiple pregnancy – helping avoid serious risks to both the mother and baby.