In medicine and (clinical) genetics preimplantation genetic diagnosis (PGD or PIGD) (also known as embryo screening) refers to procedures that are performed on embryos prior to implantation, sometimes even on oocytes prior to fertilization.

PGD is considered another way to prenatal diagnosis. Its main advantage is that it avoids selective pregnancy termination as the method makes it highly likely that the baby will be free of the disease under consideration. PGD thus is an adjunct to assisted reproductive technology, and requires in vitro fertilization (IVF) to obtain oocytes or embryos for evaluation.

The term preimplantation genetic screening (PGS) is used to denote procedures that do not look for a specific disease but use PGD techniques to identify embryos at risk. PGD is a poorly chosen phrase because, in medicine, to "diagnose" means to identify an illness or determine its cause. An oocyte or early-stage embryo has no symptoms of disease. They are not ill. Rather, they may have a genetic condition that could lead to disease. To "screen" means to test for anatomical, physiological, or genetic conditions in the absence of symptoms of disease. So both PGD and PGS should be referred to as types of embryo screening.

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Title Language Created for
Преимплантационна генетична диагностика (PGD) Bulgarian POLKA Download
Genetická Diagnostika Před Implantací (PGD) Czech POLKA Download
Præimplantations genetisk diagnostik (PGD) Danish POLKA Download
Präimplantationsdiagnostik (PID) German POLKA Download
Προεμφυτευτική Γενετική Διάγνωση (PGD) Greek POLKA Download
Pre-implantation Genetic Diagnosis English POLKA Download
Diagnóstico Genético Preimplantacional (DGP) Spanish POLKA Download
Implantantsioonieelne geneetiline diagnoos (PGD) Estonian POLKA Download
Preimplantaatiodiagnostiikka (PGD) Finnish POLKA Download
Le diagnostic pré-implantatoire (DPI) French POLKA Download
Preimplantacijska genetska dijagnostika (PGD) Croatian POLKA Download
Beültetés előtti genetikai diagnosztika (PGD) Hungarian POLKA Download
Diagnosi Genetica Preimpianto (PGD) Italian POLKA Download
Preimlantacinė genetinė diagnostika (PGD) Lithuanian POLKA Download
Pirmsimplantācijas ģenētiskā diagnoze (PĢD) Latvian POLKA Download
PGD - Preimplantasjonsdiagnostikk Norwegian Bokmål Forskerfabrikken (Scientist Factory) playsDecide Download
Pre-implantatie Genetische Diagnose (PGD) Dutch POLKA Download
Genetyczne Testy Preimplantacyjne (GTP) Polish POLKA Download
Diagnóstico Genético Pré-impantação (DGP) Portuguese, Portugal POLKA Download
Predimplantačná genetická diagnostika (PGD) Slovak POLKA Download
Predimplantacijska genska diagnoza (PGD) Slovenian POLKA Download
Preimplantativ genetisk fosterdiagnostik (PGD) Swedish POLKA Download