What are the limitations of blastocyst culturing?
If you have fewer than four to eight embryos on the third day of culture, we do not recommend proceeding with blastocyst culturing, for with this procedure we are not able to freeze as many embryos because of poor embryo development to the blastocyst stage. Also, there appears to be an increased risk of identical twinning with blastocyst culturing including the possibility of conjoint twinning where the babies may be connected and share some organs. However, this increased risk of identical twinning is less than 5 percent.
