Blastocyst Stage Embryo

A blastocyst stage embryo is an advanced form of an embryo approximately 5 to 6 days after fertilization. At this stage, the embryo has developed into a fluid-filled structure with a central cavity, an outer layer of cells called the trophoblast, and an inner cell mass that will become the baby. This stage is important in fertility treatments like IVF because the embryo has a higher chance of successfully implanting into the uterus. The blastocyst indicates that the embryo has matured enough to potentially lead to pregnancy, making it a key point in embryo selection for transfer.