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When euploid blastocysts are selected for embryo transfer, day three morphology does not correlate with implantation rate

      In an effort to determine which embryos are reproductively competent and will implant and progress to delivery, many laboratory parameters are assessed. These include blastulation, blastocyst morphologic grade, and aneuploidy status, among others.1 Even when all of these factors are considered optimal, ∼25% of embryos fail to deliver.2 Clearly, additional further discrimination amongst euploid blastocysts is needed. One consideration might be the quality of the embryos at the cleavage stage on day three.
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