Fresh Embryos as Good as Frozen Ones for In Vitro Fertilization

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For most women undergoing in vitro fertilization, fresh embryos work just as well as frozen ones.

Previous trials have suggested that using only frozen embryos might improve pregnancy rates in women with polycystic ovary syndrome, or PCOS, a hormonal disorder that affects about 10 percent of women. (Women with this condition ovulate irregularly and typically have a poorer response to IVF treatment.) But in two large randomized trials published in the New England Journal of Medicine, researchers found using fresh or frozen embryos makes no difference for the majority of women who do not have PCOS.

In the first study, of 2,157 women without PCOS, 50.2 percent of fresh embryo transfers resulted in a live birth, and so did 48.7 percent of the frozen…

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