Results: Oligohydramnios related to many factors such as amniotic fluid producing decrease,absorption and leak increase,placenta functions abnormal and embryo abnormality etc.

• 结果:羊水过少与羊水产生减少、吸收、外漏增加,胎盘功能异常、胎儿畸形等有关,可使围产儿病率、死亡率明显增加。