Jeffrey Klein’s research while affiliated with White Plains Hospital and other places

... Together with endometrial receptivity, embryo quality is a critical factor in embryo implantation (7). Several studies have agreed that P does not affect embryo quality (8)(9)(10), and this has been confirmed by data from oocyte donation (6,11) and FET cycles (8)(9)(10). Conversely, some scholars have proposed that top-quality blastocysts represented by morphological grade are affected by high P (12,13). ...

Reference:

Effects of trigger-day progesterone in the preimplantation genetic testing cycle on the embryo quality and pregnancy outcomes of the subsequent first frozen-thawed blastocyst transfer