Preimplantation Genetic Diagnosis (PGD) is a technique used during in vitro fertilization (IVF) to test embryos for specific genetic conditions before they are implanted in the uterus. This process involves extracting a few cells from an embryo and analyzing them for genetic abnormalities, allowing parents to select embryos that are free from certain inherited diseases. PGD is particularly beneficial for couples with a family history of genetic disorders or those who are carriers of specific genes. By identifying healthy embryos, PGD can help reduce the risk of passing on genetic conditions, ultimately increasing the chances of a successful pregnancy and a healthy baby.