Preimplantation genetic diagnosis (PGD) is a reproductive technology used during an IVF cycle. PGD can be used for diagnosis of a genetic disease in early embryos before implantation or pregnancy. Each cell in our body has 46 chromosomes (23 from the father and 23 from the mother). The chromosomes are made up of a substance called DNA that contains our genetic information. Information is distributed in the genes and there are two copies of each gene, one originating from the mother and the other from the father.
During pregnancy, there are two types of diagnosis to establish chromosomal and genetic alterations in the foetus: