What is pre-implantation genetic diagnosis (PGD)?
PGD is available to couples that are at risk of having a child with a specific genetic or chromosome disorder.
It involves the use of assisted reproductive technology (ART)|, which is also offered to couples with fertility problems. The aim is to obtain and fertilise a number of eggs. Once fertilised, the embryos develop for three days and then one or two cells are removed from each embryo. The genetic material (DNA or chromosomes) within each cell is then tested for the genetic or chromosome abnormality. Up to two unaffected embryos are then transferred to the uterus with the hope that they will implant and form a pregnancy. If successful, the baby should not be affected by the disorder it was tested for.
PGD is a lengthy and complex process. For more information: