Threatened abortion: a risk factor for poor pregnancy outcome, a population-based screening study

The risk of adverse outcome for pregnancies, with first-trimester threatened abortion, due to first-trimester vaginal bleeding, occurring in 16 to 25 percent of all pregnancies, is discussed. Various outcomes of the first-trimester bleeding during pregnancy include the pregnancy loss, preterm delivery, intrauterine growth restriction (IUGR), gestational hypertension, preeclampsia, preterm premature rupture of membranes (PPROM), placental abruption, placenta previa, and cesarean delivery.