What is preimplantation genetic diagnosis or PGD?
Preimplantation Genetic Diagnosis (PGD) is a technique used in fertility treatments to assess the genetic health of embryos before they are implanted in the uterus. This procedure allows the identification of possible chromosomal alterations or hereditary genetic diseases in the embryos, which increases the chances of achieving a healthy pregnancy.
Preimplantation genetic diagnosis


Preimplantation Genetic Diagnosis (PGD) is recommended in various situations in which genetic evaluation of embryos can improve the chances of a successful pregnancy and the health of the baby. For example:
- Family history of genetic diseases: If there is a history of hereditary diseases within the couple, PGD can help prevent their transmission to the baby.
- Maternal age: Women over 35 years of age have a higher risk of chromosomal alterations in embryos. PGD allows viable and healthy embryos to be identified.
- Recurrent miscarriages: If you have experienced repeated gestational losses, PGD can help identify underlying genetic causes and increase the odds of success.
- Failed IVF: In cases of failed IVF attempts, PGD can offer a more accurate assessment to improve the chances of a successful pregnancy.
Preimplantation Genetic Diagnosis (PGD) is a highly specialized process that is carried out in conjunction with In Vitro Fertilization (IVF) treatment.
In Vitro Fertilization (IVF): The eggs are fertilized with sperm in a specialized laboratory.
Embryo biopsy: On day 5 or 6 of development, a small sample of cells is taken from the embryo.
Genetic analysis: The sample is analyzed in a specialized genetic laboratory to detect possible alterations.
Embryo selection: Genetically viable embryos are selected for transfer to the uterus.
Preimplantation Genetic Diagnosis (PGD) is important because it allows the selection of embryos free of genetic alterations before implantation, increasing the chances of a successful and healthy pregnancy. Likewise:
- Increased success rate: Better chances of a successful pregnancy by selecting healthy embryos.
- Risk reduction: Decreased risk of genetic diseases and miscarriages.
- Peace of mind and security: The certainty that you are making an informed and safe decision for your family.

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