FGR: Presence of oligohydramnios is a clinically important predictor of outcome, especially when combined with estimated fetal weight of less than the third percentile (P = .007). However, false negatives have been reported with clinical or sonographic assessment of estimated fetal weight. In uncomplicated term pregnancies, risk of birth weight below the 10th percentile has been reported in fetuses with U/S findings appropriate for gestational age and isolated oligohydramnios (AFI < 5 cm). Umbilical artery Doppler has been proposed to identify cases of oligohydramnios destined for a poorer outcome independently of estimated fetal weight.