Objective: To evaluate the perinatal outcome in patients with isolated oligohydramnios. Design: A prospective study. Sample: 146 patients had isolated oligohydramnios. These were compared with those having AFI>5 cm (n=500). Methods: A prospective study was conducted from November 2012 to November 2014. Patients were divided into two groups (AFI>50 mm and ≤ 50 mm). The study inclusion criteria were women with singleton pregnancy at 36-42 weeks gestational age (GA) and women sure of the gestational age. Main outcome measures: Abnormal non-stress test, obstetric intervention for fetal distress, Apgar score, meconium stained liquor and NICU admission. Results: The two groups were similar with regard to maternal age, parity and mean gestational age. Isolated oligohydramnios was associated with higher rate of induction of labour (68.49% vs. 21.8%, p