Effect of blastocyst morphology and developmental speed on transfer strategy for grade "C" blastocyst in vitrified-warmed cycles.

And patients transferred with Day 5 euploid poor-quality blastocysts had a nonsignificant trend toward a higher implantation rate than similarly graded Day 6 blastocysts (55.77 % vs. 42.47 %) [ 15 ].

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