Blastocyst transfer can help reduce multiple pregnancies and increase pregnancy rates by using high-quality embryos. However, it's unclear if this method works well for women who respond poorly to fertility treatments. About half of embryos develop into blastocysts, and special media are used to support their growth. These media have a limited shelf life, so it's best to use them within 72 hours. In the future, improvements in treatment methods may make it possible for most patients to have a healthy pregnancy with just one blastocyst transfer.