Preimplantation Genetic Screening (PGS)

What is PGS, preimplantation genetic screening?

PGS, preimplantation genetic screening, refers to removing one or more cells from an in vitro fertilization embryo to test for chromosomal normalcy. PGS screens the embryo for normal chromosome number Humans have 23 pairs of chromosomes – for a total of 46 Having an extra or a missing chromosome causes problems One example is Down syndrome which has an extra chromosome number 21. This should be detected by PGS.
PGS does not test for a specific disease such as cystic fibrosis. That process is referred to as PGD (preimplantation genetic diagnosis).