NEW YORK (GenomeWeb) – To increase the chance of pregnancy and reduce the incidence of miscarriage, more and more fertility clinics have started using preimplantation genetic screening (PGS) to test embryos resulting from in vitro fertilization for chromosomal abnormalities before they are transferred to a woman's uterus.

In most cases, the test yields a clear-cut result: the embryo is either euploid or aneuploid, and transferring a euploid embryo enhances the rate of pregnancy, lowers the risk of miscarriage, and decreases the chance of having a baby with a birth defect.