Received 31 August 2009; received in revised form 31 August 2009; accepted 31 August 2009. published online 19 October 2009.
Based on American Society for Reproductive Medicine (ASRM) and Society for Assisted Reproductive Technology data available in 2007, ASRM's guidelines for the number of embryos to be transferred in in vitro fertilization cycles have been further refined in continuing efforts to reduce the number of higher-order multiple pregnancies. This version replaces the document of the same name that was published most recently in November 2008.
American Society for Reproductive Medicine and Society for Assisted Reproductive Technology, Birmingham, Alabama
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