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In 2017, the World Health Organization published new nomenclature for preimplantation genetic diagnosis (PGD). They renamed the procedure preimplantation genetic testing (PGT), with PGT-M for monogenic diseases and PGT-SR for structural rearrangements. Preimplantation genetic screening (PGS) was renamed PGT-A (aneuploidy). In this chapter, PGT-M and PGT-SR will be referred to as PGT.