Below normal amount of amniotic fluid. Amniotic fluid provides a cushion to the fetus against physical trauma and also permits the fetus to move while in the uterus.The volume of amniotic fluid increases throughout pregnancy until about 36 weeks of gestation. If the pregnancy is prolonged beyond the normal due date, the amount of amniotic fluid may start to decrease.The amount of amniotic fluid present is usually measured by ultrasound. If there is a decreased amount of amniotic fluid, there is increased risk of cord compression and fetal distress.
Oligohydramnios is associated with long standing maternal diabetes, pre-eclampsia, hypertension, and congenital anomalies. When oligohydramnious is present a woman is 5-7 times more likely to have a Cesarean section.