What is Pre-implantation Genetic Screening (PGS)?
Even though there are no chromosomal abnormalities detected for both partners, chromosomal abnormalities in the eggs or sperm may still occur during spermatogenesis or ovulation, producing an embryo with chromosomal abnormalities. Such embryos may fail to implant or abortion may happen easily even after implantation. The ratio ofchromosomal abnormalities in the eggs is proportional to female age. In other words, there is an increased ratio of chromosomal abnormalities in the eggs of women as they age. PGS is intended to examine the embryo’s chromosome so as to transfer embryos with normal chromosome in order to increase the pregnancy rate and reduce the miscarriage rate.
What is Pre-implantation Genetic Diagnosis (PGD)?
Both partners are known to have familial diseases or suffer from known genetic diseases or are carriers for known genetic diseases. In order to protect the coming babies from the same diseases, PGD is utilized to examine certain genetic diseases of the embryo and to transfer embryos without illness.