Preimplantation genetic screening explained This article has been contributed by Embryologist, Sareena Sharma for IVF London– specialist fertility clinic based in Elstree, London. What is Preimplantation Genetic Screening (PGS)? Preimplantation genetic screening is a method used to check the number of chromosomes in an embryo. Up to 50 % of embryos produced may have an […]