A randomized controlled study with 200 pregnant women with idiopathic oligohydramnios between 28 and 32 weeks. Women were randomized to receive 3 mg warfarin daily (Warfarin group) or placebo (Placebo group). Outcomes included amniotic fluid index (AFI), duration of pregnancy and perinatal outcomes including Apgar score, Neonatal intensive care admission (NICU).