IVF

Why single embryo transfer during IVF sometimes results in twins or triplets

Source Eureka Alert

It has been known for some time that it is better to transfer a single embryo to a woman’s womb during assisted reproduction treatment (ART) rather than several embryos in order to avoid a multiple pregnancy and the risks associated with it such as foetal deaths, miscarriage, premature delivery and low birthweight. However, even when single embryo transfer (SET) is performed, some women still become pregnant with twins or even triplets.

In a study published today (Tuesday) in Human Reproduction[1], one of the world’s leading reproductive medicine journals, researchers have investigated one of the reasons why this happens and have, for the first time, been able to calculate that the proportion of multiple pregnancies after SET is 1.6% and that 1.36% of multiple pregnancies after SET occur as a result of a process called zygotic splitting

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