The transfer of the human embryo at the blastocyst stage during an in-vitro fertilization procedure is a way of increasing implantation rates. This, in turn, means that significantly fewer embryos are required to be transferred in order to establish a successful pregnancy. The result of this is that high order multiple gestations are eliminated, while maintaining high pregnancy rates, in in-vitro fertilization.
Colorado Center for Reproductive Medicine, Englewood, Colorado, USA
Correspondence to Dr David K. Gardner, Colorado Center for Reproductive Medicine, 799 East Hampden Ave., Suite 300, Englewood, Colorada 80110, USA