Amniotic fluid volume was serially assessed by real-time ultrasound in 90 patients who presented with premature rupture of the membranes (PROM) and not in labor. The degree of oligohydramnios was correlated to the outcome of pregnancy, as reflected by pregnancy prolongation, intrapartum fetal heart rate patterns consistent with umbilical cord compression, cesarean section rate, fetal distress, infection, and perinatal mortality rate. These data suggest that in patients with PROM the degree of oligohydramnios is positively correlated with unfavorable pregnancy outcome.