Yes, pregnancy can be achieved with embryos of quality D. However, the possibilities are too low.
The Association for the Study of Reproductive Biology (ASEBIR) establishes morphological criteria for the classification of embryos according to their quality. Grade D embryos are considered to be of poor quality and have low, but not zero, implantation rates.
Whenever possible, quality A and B embryos should be transferred before grade C or D embryos.
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