Preimplantation Genetic Screening

Preimplantation Genetic Screening (PGS) is a test that uses cells from a developing embryo to test for aneuploidy - an error that results in deleted, extra, or translocated chromosomes. PGS helps IVF physicians identify embryos that are chromosomally normal and most appropriate for transfer, as these embryos are more likely to develop to term and result in the birth of a healthy baby. PGS scans 24 chromosome types: 22 non-sex chromosomes and two sex chromosomes (X and Y). Aneuploidy is usually not inherited and is associated with advanced maternal age.


Let us get in touch 

PGS is an exceedingly complex procedure. Here at Compass we want to guide you and ensure you choose a treatment plan that is apporpriate for your circumstances. If you want to learn more about PGS and how it can benefit your treatment, fill out the form below and one of our scientists will be in touch, or scroll down to read more. 

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About PGS

All pregnancies have some risk of chromosome abnormality. In fact, it is estimated that the leading cause of miscarriage is chromosomal abnormalities with approximately half of all embryos carrying the wrong number of chromosomes. This risk increases as women age.

PGS reduces the need for double embryo transfer by identifying the embryo that has the best chances of success. A healthy embryo is the major contributing factor behind successful pregnancy. PGS maximises your chances for success by ensure that the first embryo selected in the embryo which is most likely to implant successful and deliver a healthy baby.

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Important facts

  • When you undergo PGS it isn’t possible to receive a "fresh" transfer as all cells have to be analysed after the embryo reaches day 5. This means that all embryos are frozen and transferred after analysis has been completed.

  • The turn around time for screening is 2-3 weeks. This may, however, be increased depending on volume.

  • Compass Fertility will not implant embryos that come back with negative results.

  • We have a genetic counsellor available to discuss your results with you when the arrive. Often the results can be confusing so speaking with a counsellor is can be a good idea.