Preimplantation Genetic Testing for Aneuploidy

Preimplantation genetic testing for aneuploidy (PGT-A), is a genetic test done to identify embryos with an abnormal number of chromosomes (known as aneuploidy) that are less likely to lead to a viable pregnancy. Embryos identified as abnormal are typically not selected for transfer to a uterus.

The older terminology used for PGT-A is preimplantation genetic screening (PGS).