Blastocyst Transfer

Blastocyst Transfer Occurs on Day 5 after Egg Retrieval

Embryos are generally transferred to the uterus on the third day after follicle aspiration, when the fertilized eggs that have divided are between six and eight cells. At this stage, we transfer between three to five embryos, based on the patient's age, rate of cell division, and egg quality.

In the past few years, the standard of care is moving toward transferring embryos on day five, with the embryos at more than 130 cells. This is the called the blastocyst stage.

A blastocyst is an embryo that has developed for five days after fertilization and has divided into two different cell types. The embryos that survive to day five of development are usually strong and healthy, and typically offer a greater chance of implantation into the uterine wall. At the blastocyst stage (day five), we usually transfer one or two embryos, which leads to a lower rate of multiple pregnancies. If there are more than two embryos, remaining blastocysts may be cryopreserved for future use.

Did You Know?

Fort Worth Fertility has the only free standing IVF lab in Fort Worth.