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The IVF Fertility Blog

Preimplantation Genetic Diagnosis (PGD) vs. Preimplantation Genetic Screening (PGS)

Genetic testing is an important part of in-vitro fertilization (IVF), particularly for couples with a high risk of genetic disease. By evaluating embryos prior to implantation, fertility experts are able to substantially reduce the likelihood of genetic disease.  Embryos may be screened via two methods: preimplantation genetic diagnosis (PGD) and preimplantation genetic screening (PGS).


Preimplantation Genetic Diagnosis3.17

Preimplantation genetic diagnosis (PGD) is performed to look for a specific genetic disease.  To perform this test, a single cell is removed from the developing embryo.  This cell is then analyzed to determine if a particular genetic disease exists.  This testing method is ideal when there is a concern about a specific genetic disease due to their own genetic history.  

Preimplantation Genetic Screening

Preimplantation genetic screening (PGS) evaluates the number of chromosomes an embryo has.  Humans have 23 pairs of chromosomes.  PGS evaluates an embryo to determine if it has the correct number of chromosomes.  Having too many or too few chromosomes is evidence of a genetic defect.  This test does not look for specific diseases, rather it aims to identify embryos that have an abnormal number of chromosomes.  As a woman ages, the chance of her having embryos with an abnormal number of chromosomes rises.  

Candidates for Genetic Testing

Genetic testing can benefit everyone who is undergoing IVF.  However, certain groups of individuals should seriously consider genetic testing including:

  • Women who are over age 35

  • Women who have had multiple miscarriages

  • Women who have had multiple failed IVF cycles

  • Individuals who are known to be carriers for genetic diseases

  • Couples who have a child with a genetic disease

Performing genetic testing decreases the likelihood of miscarriage and increases the probability of a healthy live birth.  The cost of genetic testing may not be covered by insurance.  However, the benefit of transferring healthy embryos often covers the out-of-pocket cost.

To learn more about PGD and PGS and their role in IVF treatment, contact the fertility experts at New Hope Fertility Center today.  Please click the link below to enter your information and New Hope will contact you, or simply call 212-517-7676. Thank you.


Schedule Your Consultation With New Hope Fertility


Topics: PGD, genetic screening

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