As discussed in early blogs, PGS and PGD are the techniques, which offer testing of the embryos before their transfer into the uterus. While PGS identifies the embryos with numerical chromosomal aberrations, PGD is a directed molecular diagnostic test for a particular gene of interest. In couples using those techniques, accurate and reliable determination of single gene defects, chromosome structure, and chromosome number is used to advise embryo selection before the embryo transfer. For many, this is much more desirable option than waiting for fetal diagnosis within the first or second trimester of pregnancy. Read more