What is Preimplantation Genetic Diagnosis?

"There is now a new technique called as preimplantation genetic diagnosis. Essentially the major component of this is through IVF or invitro fertilization. What is done in this technique is the father’s sperm and the mother's eggs are fertilized in vitro. The embryos are prepared outside the body and these embryos are screened for the genetic errors, which has been already detected or diagnosed in a previous member. Out of these screened embryos, only the healthy unaffected embryos are selected for implantation into the mother’s womb such that the family knows right since day 1 that the baby which is growing is a healthy one. The advantages of preimplantation genetic diagnosis is that the families have a clear idea about the status of their child right since day 1. In prenatal diagnosis the couples get this clarity only by 14 to 20 weeks after the results of the prenatal tests are available"