Preimplantation genetic testing is a set of laboratory methods that allow for the examination of the genetic makeup of embryos created through in vitro fertilization (IVF ) before their implantation (transfer) into the uterus. The examination is performed after the extraction (biopsy) of one or more cells in the early stages of embryo development.

Preimplantation testing is most commonly focused on random newly occurring genetic changesthat may negatively affect the success of IVF treatment or cause the birth of a child with mental and/or physical disabilities. However, it can also target genetic diseases that already occur in the family..