Pre-implantation Genetic Screening (PGS)

PGS checks the number of chromosomes in each embryo at the blastocyst stage (a blastocyst is an embryo that has been developed in the laboratory for five or six days after fertilisation).

Because many blastocysts have the wrong number of chromosomes (a condition known as aneuploidy), PGS is a powerful tool for selecting a good embryo for transfer. Aneuploidy can lead to miscarriages, birth defects and other complications.

Benefits of PGS:
  • Birth rates can be as high as 65-70% for normal embryos
  • Lower miscarriage rate
  • More certainty for people about the likely outcome of treatment.
Who can particularly benefit from PGS?
  • Women aged 36 and over.
  • Women who have had recurrent miscarriages.
  • Women who have not become pregnant despite the transfer of several embryos.
How PGS works:
  1. About 5-6 cells are biopsied from each blastocyst using a fine glass needle.
  2. The blastocysts are frozen for later use.
  3. The cells are sent to a specialist genetic laboratory for analysis.
  4. Chromosomally normal blastocysts are transferred at a later date after thawing.


To find out if PGS is right for you please watch our video below. 
Useful to know
  • Embryo selection with PGS does not increase the overall chance of a baby from all the embryos available, but it can reduce the time to pregnancy by giving a better choice of which embryo to use first.
The Cost of PGS

The fees for using PGS are covered in our fees section.

  • The PGS fee is a per embryo charge and covers the embryo biopsy and testing from the IVF cycle.
  • To do PGS, you need to use ICSI as part of the IVF cycle, and you will need to have frozen embryo transfers to use suitable embryos. The costs of these are separate to the cost of the PGS testing.

PGS Comments or questions?

If you still have questions after viewing the PGS video above, please enter them below. We also appreciate any feedback regarding our PGS Education Video.

Support every step of the way

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