Abstract

More than 100,000 assisted reproductive technology (ART) cycles are started yearly in the U.S. Partly due to our inability to select the best embryo(s) to be transferred, a mean number of 3.1 embryos are transferred in ART cycles using fresh nondonor oocytes. This leads to a 34.3% overall pregnancy rate, 29.0% of which result in multiple-infant live births. Similarly, a mean number of 2.5 embryos are transferred in ART cycles using fresh donor oocytes, achieving a 50.4% pregnancy rate, 44.7% of which result in multiple-infant live births (SART 2002).

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