What does PGS or Preimplantation Genetic Screening involve?2019-07-05T06:52:32+00:00
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Preimplantation Genetic Testing (PGT-A)

Selects the eggs with a correct genetic load

The PGT-A (old PGS) is a laboratory technique that enables us to study the DNA of the eggs or embryos in order to select those that have a correct genetic load. It is done within In Vitro Fertilization programmes. In embryos, it provides very good results.

Benefits

It allows for the selection of eggs and embryos with a correct genetic load.

Process

Step 1

Study icon

Genetic study

After performing the In Vitro Fertilization, and before the transfer to the uterus, the genetic material of the embryo is studied in order to detect genetic alterations.

Step 2

Embryo biopsy

A biopsy is performed on each embryo and those which have an abnormal number of chromosomes are discarded.

Step 3

Transfer

One to two healthy embryos are transferred. The healthy embryos can be frozen.

Step 1

Study icon

Genetic study

After performing the In Vitro Fertilization, and before the transfer to the uterus, the genetic material of the embryo is studied in order to detect genetic alterations.

Step 2

Embryo biopsy

A biopsy is performed on each embryo and those which have an abnormal number of chromosomes are discarded.

Setp 3

Transfer

One to two healthy embryos are transferred. The healthy embryos can be frozen.

The diagnosis can be obtained in two different ways

Icon lupa embryos
Icon lupa embryos

Preimplantation Genetic Testing with embryos

Once the in vitro fertilization is done and before transferring the embryo to the uterus, a study is carried out to detect whether the genetic load is correct. It is done when the embryos are at the 6-8 cell phase or the blastocyst stage, preferably depending on their quantity and quality. A biopsy is performed on each one and only the healthy embryos are selected, which are the ones that are transferred to the uterus.

Preimplantation Genetic Testing with eggs

This technique allows us to detect genetic or chromosomal diseases in the egg, before the embryo is formed. This technique analyses a part of the egg called the polar corpuscle, so only hereditary diseases from the mother can be detected. A biopsy of the polar corpuscle is done, and after that, the oocytes are inseminated with the intracytoplasmic sperm injection (ICSI). After two days, the genetic result is obtained and the embryos from the healthy oocytes are selected for transfer.

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