Comparison of clinical outcomes for different morphological scores of D5 and D6 blastocysts in the frozen-thawed cycle

Abstract excerpt

BACKGROUND: Both embryo development speed and embryo morphology score played a significant role in frozen-thawed embryo transfer cycle (FET) outcomes. Most of the literature indicates that D5 embryos performed better than D6 embryos, although a few also indicate that there is no difference in clinical outcomes between D5 and D6 embryos. Clinically, D5 embryos are preferred for equal morphological scores. But how...

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