Preimplantation Genetic Screening (PGS) is a laboratory procedure used during in vitro fertilization (IVF) to identify genetic abnormalities in embryos before they are implanted in the uterus. By analyzing the embryos' chromosomes, PGS helps ensure that only those without significant genetic issues are selected for transfer, potentially increasing the chances of a successful pregnancy. This screening is particularly beneficial for individuals or couples with a history of genetic disorders, advanced maternal age, or repeated IVF failures. By reducing the risk of miscarriage and genetic diseases, PGS can lead to healthier pregnancies and improve overall reproductive outcomes.