As fertility medicine has matured and advanced over the years, researchers and physicians have developed sophisticated tools and techniques to help patients achieve their ultimate goal: a healthy baby. One such tool is preimplantation genetic diagnosis, also known as PGD. When used in conjunction with IVF, PGD can reduce or eliminate the risk of certain genetic diseases. It can also greatly increase some patients’ chances of a successful pregnancy, especially in cases where the patient has suffered a series of unexplained miscarriages. Understanding how PGD works, why it is used, and what it has to offer will help you decide whether it is an option you would like to pursue with your fertility doctor.