Abstract
Recent studies have demonstrated that extended culture of blastocysts to day 7 leads to satisfactory pregnancy outcomes in patients with slow-growing embryos.1,2 However, even when confirmed to be euploid by preimplantation genetic testing for aneuploidy (PGT-A), day 7 embryos have lower rates of implantation, clinical pregnancy, and live birth compared to day 5 or day 6 embryos.1 Prior studies assessing factors associated with implantation of euploid embryos only assessed embryos biopsied on day 5 or 6.
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