![]() If the pregnancy is low risk and there are no complications, there is no evidence to support induction for women with oligohydramnios. Often women who are post dates will be sent for a routine scan and a low fluid result is not surprising, given that amniotic fluid levels normally begin to decline from around 37 weeks of pregnancy. However this may not always be the best option. Induction of labour is the usual management for low amniotic fluids, regardless of whether there is a complication putting the baby at risk or not. There is no current standard as to what is considered high or low amniotic fluid, and most cases are isolated – meaning there is no underlying issue causing the fluid levels to decrease. When the AFI shows a fluid level of less than 5 centimetres, the absence of a fluid pocket 2-3 cm in depth, or a fluid volume of less than 500mL at 32-36 weeks gestation, then oligohydramnios is suspected. Deep pocket measurements: the single deepest vertical pocket of fluid is identified by ultrasound and measured in centimetres.Amniotic fluid index (AFI) evaluation: four ‘pockets’ of fluid are measured by ultrasound and added up, resulting in an Amniotic Fluid Index (AFI). ![]() The amount of fluid can be measured using two methods: You can read more about amniotic fluid levels here. Today, diagnosis is done by ultrasound and estimates the amount of fluid in the uterus surrounding the baby. When oligohydramnios occurs in the second half of pregnancy, the following complications can happen:
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