Blastocyst age, expansion, trophectoderm morphology, and number cryopreserved are variables predicting clinical implantation in single blastocyst frozen embryo transfers in freeze-only-IVF

To determine which blastocyst assessment variables predict clinical implantations in single blastocyst frozen embryo transfers (FET) of freeze-only-IVF cycles, following improved vitrified-warmed blastocyst survival and developmental competence preservation.本研究旨在明确：在经优化玻璃化冷冻复苏技术以提升囊胚（blastocyst）存活率、保留其发育潜能的仅冷冻体外受精（In Vitro Fertilization, IVF）周期中，单囊胚冷冻胚胎移植（Frozen Embryo Transfer, FET）场景下，哪些囊胚评估变量可预测临床着床结局。