Avoiding multiple pregnancies in ART: evaluation and implementation of new strategies.

Strategies for reducing the multiple pregnancies which increase perinatal mortality and morbidity in women undergoing IVF are discussed. Elective single embryo transfer with the promise of subsequent transfer of frozen-thawed embryos would achieve the goal of a single healthy child as a result of IVF treatment. The urgent establishment of a definitive trial comparing elective single versus double embryo transfer is advocated.