10/16/2026
There are a few different types of preimplantation genetic testing (PGT) used with IVF, and each one looks for something different.
PGT-A, preimplantation genetic testing for aneuploidy, screens embryos for extra or missing chromosomes. It's the type most commonly offered as an add-on to IVF.
PGT-M, preimplantation genetic testing for monogenic disorders, looks for a specific single-gene condition, like cystic fibrosis or sickle cell disease. Unlike PGT-A, PGT-M generally requires customized test development for the particular genetic condition before testing embryos.
PGT-SR, preimplantation genetic testing for structural rearrangements, is used when a parent carries certain chromosome rearrangements, such as a balanced translocation. It looks for embryos with an unbalanced amount of chromosome material related to that rearrangement.
PGT-P, preimplantation genetic testing for polygenic conditions, is a newer type of testing. It uses polygenic risk scores to estimate an embryo's genetic likelihood of developing certain complex conditions influenced by many genes, such as type 2 diabetes or heart disease. The American Society for Reproductive Medicine (ASRM) currently says PGT-P is not recommended for clinical use and should not be offered as a clinical service at this time.
As an IVF mom and a fertility lawyer, I'm pro-IVF and believe you deserve clear, accurate information about every test you're offered. Questions about embryo testing are always welcome below.
This is for informational purposes only and is not legal or medical advice.