Vanishing twins: the frequency of spontaneous fetal reduction of a twin pregnancy

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Abstract
This study examines the outcome of 126 twin pregnancies diagnosed by ultrasound examination at 6-16 weeks' gestation. Fifty-nine patients conceived by in vitro fertilization (IVF) and embryo transfer and had a routine scan. The 67 non-IVF pregnancies had a scan for other clinical indications including threatened abortion. When live twins were detected prior to 7 weeks'gestation, only 71% of pregnancies resulted in live twin neonates. Each fetus of a multiple pregnancy had a 19% chance of dying in utero or in the neonatal period of diagnosed prior to 7 weeks, and 11% if both were found to be alive between 7 and 10 weeks. The fetal loss rate was similar for IVF and non-IVF pregnancies.

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