1.Postterm pregnancy
2.Prematrue rupture of mambrane
3.Preeclampsia,eclampsia
4.Gestational hypertension
5.Chorioamnionitis
6.Fetal demise
7.Abruptio placenta
8.Maternal medical condition : eg.DM,renal disease,chronic pulmonary disease,chronic hypertension,antiphospholipid syndrome
9.Fetal compromise :eg.Severe fetal growth restriction,isoimunization,oligohydramios