Patients were eligible for inclusion if they were 28t to 32 weeks of pregnancy and age 18-35 years and diagnosed to have idiopathic oligohydramnios excluded by medical history and detailed u/s examination,the cut off AFI was less than 5cm. A written informed consent was taken. Gestational age was determined on the basis of the last menstrual period, confirmed by an ultrasound scan conducted between 6 and 14 weeks of gestation The clinical work-up included a history taken prior to enrollment, examination, obstetric ultrasound evaluation, and biophysical profile taken after 32 weeks of pregnancy Exclusion criteria were chronichypertension, anaemia ,cardiac diseases ,or history of premature rupture of membrane or structural malformations. Sterile speculum examination was done to exclude rupture of membrane. Detailed level 2D ultrasonography to determine the possible etiology and to exclude the multiple pregnancy and fetal death. All fetuses were alive with fetal weight were prior treatment and each follow up visits. Doppler ultrasound for uterine, umbilical and middle cerebral arteries, and fetal ascending aorta was done using resistant index (RI), pulsetilty index (PI) and systolic/diastolic (S/D) ratio before and in each follow up visits. Laboratory tests were obtained included complete blood picture, liver function test, immunological tests to exclude antiphospholipid antibodies was done. After these all patients with unknown major cause were classified as idiopathic oligohydramnios and the treatment started to them.