Hum. Reprod. Advance Access published online on April 14, 2005
Human Reproduction, doi:10.1093/humrep/dei025
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1 Epidemic Intelligence Service, Epidemiology Program Office, Division of Reproductive Health, Centers for Disease Control and Prevention, Atlanta, GA 30341-3724, USA and
* To whom correspondence should be addressed. BACKGROUND: Multiple births are associated with serious adverse infant and maternal outcomes. The objective of this study was to assess the multiple-birth risk (MBR) associated with IVF and determine whether the risk is impacted by stage of embryo development at transfer. METHODS: A population-based sample of 50 819 IVF transfers utilizing day 3 or day 5 embryos performed in the USA in 2001 on women aged 20-40 years was used to assess MBR and live-birth rate (LBR), stratified by patient age, supernumerary embryo availability, and number of embryos transferred. RESULTS: Although significantly more day 5 than day 3 transfers used
Received January 10, 2005
Revised February 25, 2005
Accepted March 7, 2005
Article
Multiple-birth risk associated with IVF and extended embryo culture: USA, 2001
2 Assisted Reproductive Technology Epidemiology Team, Women's Health and Fertility Branch, Division of Reproductive Health, Centers for Disease Control and Prevention, Atlanta, GA 30341-3724, USA
D.M. Kissin, E-mail: DKissin{at}cdc.gov
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Abstract
2 embryos (69.2 versus 27.7%), the former were not associated with decreased MBR. MBR was high when >1 embryo was transferred, irrespective of embryo development stage. LBR were generally maximized with 2 embryos transferred, and for some (day 5 transfers, patients aged 35-37 years) with one embryo. Electing to transfer a single day 5 embryo appeared efficacious for some patients: women aged 20-37 years with supernumerary embryos cryopreserved had LBR of 31.6-39.5%. CONCLUSIONS: MBR is high when
2 embryos are transferred. Single embryo transfer is the only way to prevent many multiple births and associated adverse health outcomes.![]()
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