植入前基因诊断(PGD)是结合使用用实验室程序在体外受精(IVF)减少传递继承条件的风险。 Some of the most common reasons for PGD are specific single-gene conditions (such as cystic fibrosis or sickle cell anemia) and structural changes of a parent's chromosomes. Families may also use PGD when a member of the family needs a bone marrow donor, as a way to have a child who can provide matching stem cells.