Elevated estradiol levels on hCG trigger day adversely effects on the clinical pregnancy rates of blastocyst embryo transfer but not cleavage-stage embryo transfer in fresh cycles: a retrospective cohort study.

For the blastocyst group, CPR expressed a decreasing trend ( P = 0.016), and patients in set 4 had a significantly lower CPR compared to those in set 1 (38.1% vs. 56.2%, P = 0.007).

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Although the rates of preterm birth and LBW showed an increasing trend in both embryo stage groups, the differences among E 2 level sets of the two groups were not statistically significant.

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