Development potential of low score embryos

Objectives: To explore the development potential of the low score embryos in vitro blastocysts culture.Methods: The third day(D3) low score embryos from IVF/ICSI cycle was put in vitro blastocysts culture,and the blastula development was observed.The compact mulberry embryo and blastocysts were frozen and then further thawed to observe the clinical outcomes.Results: A total of 2058 low score embryos from 613 cycles were cultured and finally formed 753(36.59%) blastulas and 13 compact mulberry embryos.Among the embryos,322 blastulas and compact mulberry embryos were frozen(15.65%),including 220 cycles of frozen(35.89%).In the 220 frozen cycles,there were 54 freeze-thaw transplantation cycles,and the clinical pregnancy rate was 33.33%(18/54).Conclusion: Blastocysts culture can sort out the embryos with development potentials,and can make better use of t he embryos to improve accumulative pregnancy rate.