Transfer the best and biopsy the rest? Blastocyst euploidy rates differ by morphology and day of biopsy

Purpose To determine if blastocyst euploidy rates differ by embryo morphology or day of biopsy. Methods We performed a retrospective analysis of euploidy rates based on patient age, overall embryo morphology grade (good, fair, or poor), and day of biopsy (days 5, 6, or 7) for blastocysts undergoing preimplantation genetic testing for aneuploidy (PGT-A). Our primary analysis included 904 embryos from oocytes age 33–39 years at retrieval. Results In our primary analysis, euploidy rates were higher for good quality embryos than poor (64% vs. 48%, p