Can be performed either on the eggs or on the embryos, the latter delivering the best results.
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PGS by array CGH is a laboratory technique that allows us to study the DNA of eggs or embryos in order to select those with a correct genetic load.
This technique is done as part of IVF programmes. Your doctor will tell you whether it could be helpful in your case.
The diagnosis can be obtained in two different ways:
Preimplantation genetic diagnosis with embryos
Once in vitro fertilization is performed and before transferring the embryo to the uterus, the genetic material is examined in order to detect whether the genetic load is correct.
This study is performed when the embryos are at 6-8 cell stage, generally on the 3rd day of development. In order to examine their genetic material a biopsy is carried out on each embryo and only the healthy ones are selected for transfer to the uterus.
Preconception diagnosis with eggs
Genetic diagnosis to detect genetic disorders eggs or chromosomal egg before the embryo is formed.
This technique analyses a specific part of the egg, the polar body, so it can only detect inherited diseases of maternal origin.
In order to study the mature egg a polar body biopsy is carried out by making a small opening in the zona pellucida that surrounds it. Having identified the normal eggs, they are inseminated by Intracytoplasmic Sperm Injection (ICSI) thus obtaining embryos suitable for transfer to the uterus.
Last Updated: May 2017