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Single Embryo Beat Double Embryo Transfer in IVF Study

US News & World Report,  Dec 22, 2010

Women who undergo in-vitro fertilization (IVF) are almost five times more likely to give birth to a single healthy baby following the implantation of a single embryo than are women who choose to have two embryos implanted at the same time, an international team of experts has found.

The finding comes from an analysis of data involving nearly 1,400 women who participated in one of eight different embryo transfer studies. Approximately half of the women underwent procedures involving the single transfer of an embryo, while the other half underwent a double embryo procedure.

Overall, the study authors noted that, relative to a double embryo transfer, a single embryo transfer appears to significantly increase the chances of carrying a baby to a full term of more than 37 weeks.

In addition to lowering the risk for premature birth, a single embryo transfer also appeared to lower the risk for delivering a low birth weight baby, D.J. McLernon, a research fellow with the medical statistics team in the section of population health at the University of Aberdeen in the United Kingdom, and colleagues reported in the Dec. 22 online edition of the British Medical Journal.

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