Nearly as many women who received only one embryo at a time gave birth as women who received two embryos. At the same time the risk of giving birth to twins is minimized. These are the findings of a major study from the Sahlgrenska Academy, at Göteborg University in Sweden.
In-vitro fertilization, IVF, is a successful method to help childless couples to become parents. To maximize the chance of pregnancy, physicians have generally reintroduced more than one embryo. This has led to a considerably larger proportion of multiple births compared with spontaneous pregnancies. Multiple birth means two or more children in the same pregnancy, most often twins. Expecting more than one child entails greater risk. These children are often born prematurely and often have low birth weight. To reduce the number of pregnancies with more than one child, the Swedish National Board of Health and Welfare recommends that only one embryo be transferred at a time.
In the worlds largest controlled study, scientists at the Sahgrenska Academy in Gothenburg have compared deliveries in two groups of women who underwent IVF. Half of the women first had one embryo transferred. If it did not develop, they received a second embryo that had been kept frozen until it was reintroduced. The other half of the women received two embryos from the beginning. The study comprised 661 women under the age of 36 from 11 clinics in Scandinavia.
Ulrika Lundin | alfa
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