Assisted hatching is an additional procedure that can be performed in patients who are undergoing in vitro fertilization (IVF) treatment. Once embryos are created using IVF, the embryo is surrounded by a hard outer layer of cells called the zona pellucida. This outer layer is the “shell” of the embryo. An embryo must break free of this “shell” to implant into the uterus and develop into a pregnancy. Assisted hatching is a procedure where we can help the embryo “hatch” from its “shell” by creating a small crack in the zona pellucida. It is believed that assisted hatching can help an embryo implant in the uterus, leading to higher pregnancy rates in some patients. Assisted hatching is generally performed on the third day of embryo development. The embryologists use a laser to create a very small hole in the zona pellucida. Assisted hatching can also be done on previously frozen and thawed embryos.