
GenoCare— with Dr Ali Archibald & friends
Episode 31: Chromosome Testing of Embryos in IVF - Understanding PGT-A
In this episode, Ali is joined by senior genetic counsellor Tamara Mossfield to unpack preimplantation genetic testing for aneuploidy (PGT-A) — a type of embryo testing used during IVF to look for differences in chromosome number. This is the third episode in a series on genetic testing in IVF. Tamara explains what PGT-A is, how testing is performed, what the different results can mean, and why deciding whether to have PGT-A is not always straightforward. Drawing on her extensive experience supporting people through IVF, Tamara explores why PGT-A is optional, why recommendations can differ between clinicians, and how factors such as maternal age, recurrent pregnancy loss and repeated implantation failure may influence discussions about testing. The conversation also explores one of the more complex areas of PGT-A: mosaic results . Tamara explains the biology behind mosaicism, what a mosaic result may mean, and how patients and their clinical teams navigate decisions about which embryos to consider for transfer. In this episode: What PGT-A is and what it looks for How PGT-A is performed during IVF Why PGT-A is optional and why recommendations can vary Factors that may influence whether PGT-A is considered How people decide whether testing is right for them The benefits and limitations of PGT-A Understanding failed, euploid, aneuploid and mosaic results What mosaicism means and why these results can be complex How PGT-A results may influence decisions about embryo transfer Navigating uncertainty and the emotional and ethical considerations involved in embryo selection Key message PGT-A can provide information about the chromosome complement of an embryo, but it does not provide certainty about the outcome of an embryo transfer or pregnancy. Understanding what the test can and cannot tell you, and having appropriate support to interpret the results, is an important part of informed decision-making. This episode is valuable for: People considering or undergoing IVF and PGT-A, as well as fertility specialists, embryologists, genetic counsellors, IVF nurses, GPs, midwives and other healthcare professionals supporting people through fertility treatment. Other relevant episodes: Episode 4:Pre-implantation genetic testing (PGT-M): what clinicians and patients need to know https://open.spotify.com/episode/5VerEM5kIXpivhuvMke0Ux?si=P5WfF7eMTEiTBjAKSRmHAw Episode 16: Genetics in the IVF setting https://open.spotify.com/episode/4Rpc0ITs6x18L7lVmE7y5D?si=4dda2d755a0b4d18 Referring to GenoCare? GenoCare provides genetic counselling and perinatal counselling before, during and after pregnancy, working alongside existing fertility, maternity and genetic services. hello@genocare.com.au | www.genocare.com.au/contact

