Preimplantation genetic testing (PGT) is a procedure used during in vitro fertilization (IVF) to identify genetic abnormalities in embryos before they are implanted in the uterus. This testing helps couples who are at risk of passing on genetic disorders to ensure that only healthy embryos are selected for implantation. There are different types of PGT, including PGT-A for aneuploidy screening and PGT-M for specific genetic conditions. By analyzing the embryos' genetic material, healthcare providers can increase the chances of a successful pregnancy and reduce the risk of inherited diseases.