How is the risk of multiple pregnancy reduced?

There are several methods of reducing the chance  of multiple pregnancy and its associated risks and complications. These include limiting the number of embryos transferred and using blastocyst transfer techniques.

• Limiting the number of transferred embryos to two or even one can reduce the risk of multiple pregnancy. There is some evidence that if there are more than 4 embryos created, then the transfer of two embryos will achieve a similar pregnancy rate to 3 embryos but the multiple pregnancy rates will be less.
• Recently, new legislation in countries such as Belgium imposed a restriction to a single embryo transfer (SET) for women less than 36 years in their first treatment cycle.

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