Pregnancy Outcomes of Frozen-Thawed Blastocysts versus Blastocysts Derived from Frozen-Thawed Cleavage Embryos: A Retrospective Study.

The strategy of culturing frozen-thawed cleavage embryos for two days and transferring them as blastocysts is not inferior to the transfer of frozen-thawed blastocysts. It increases workload for embryologists and poses a risk of cycle cancellation. We propose that the use of frozen-thawed blastocysts may be a more efficient and patient-friendly option.