Assisted hatching is usually used as a complementary technique since in some cases it can help the implantation of the embryo. It involves making a small hole in the pellucid layer that covers the embryo (the area that protects the embryo) to promote hatching (the embryo leaving its membrane) for subsequent implantation.
It is usually recommended for patients who have obtained poor quality embryos in previous treatments, in elderly patients (whose oocytes have a thicker or more hardened membrane) and in implantation failures. It is of great help to use it in the transfer of embryos that have already been cryopreserved.
It should only be used in the cases described above, in the rest of the clinical situations it is not advisable because it does not imply any confirmed benefit.