PGT and TGP refer to the same term, but in English and Spanish respectively. In English, PGT stands for Preimplantational Genetic Testing. As it’s the international scientific language, this is the most common. TGP in Spanish refers to the same test. PGD stands for Preimplantational Genetic Diagnosis and PD for Preimplantational Diagnosis. The latter two are increasingly uncommon, as this analysis is not considered a diagnosis as such, but instead screening of a representative part of the whole embryo.