One or two embryos implanted in IVF 'have best results'

12 January 2012

New research has uncovered the optimum number of embryos to implant during IVF fertility treatment, according to latest reports.

Scientists at the University of Bristol showed that one or two embryos could be applied to a female's treatment plan, but three should never be implanted into the uterus of a woman of any age.

Published in the Lancet and based on data from the UK Human Fertilisation and Embryology Authority, the study analysed 124,148 IVF cycles which resulted in 33,514 births. Scientists compared rates of live birth, multiple births and levels of preterm birth in women under and over 40 years old.

The researchers said: "In both age groups, transfer of three embryos did not increase the live birth rate over that seen after transfer of two embryos, but was associated with an increased risk of adverse perinatal outcomes."

A survey by the Daily Mail found that the number of women over 40 opting for IVF treatment has soared in recent years, with around half of women visiting some clinics matching this age group.

Posted by Philip Briggs

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