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Chromosomal abnormalities are responsible for a substantial proportion of early pregnancy losses and increase with maternal age. Egg quality is considered to be the major cause of reduced implantation rates, and therefore viable pregnancy rates.

Preimplantation genetic screening (PGS), also known as preimplantation genetic testing (PGT),  involves testing individual cells removed from embryos before their replacement back into the uterus, with the intention of selecting normal embryos.


You may be a candidate for PGS if:

  • You and/or your partner are carriers of an abnormal gene (PGD)
  • You and/or your partner have a chromosome abnormality such as translocation (PGT-SR)
  • Other members of your family carry an abnormal gene (PGD or SR)
  • You have experienced two or more pregnancy losses in the first trimester or one loss in the second trimester

Related videos

About Preimplantation Genetic Diagnosis and Screening (PGD and PGS)

Northwell Health Fertility experts discuss what makes PGD and PGS so revolutionary—and how they use these procedures to significantly increase their patients’ chances of having a healthy baby.

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