39 weeks pregnant amniotic fluid index how much is normal

The amniotic fluid volume in the third trimester of pregnancy should be maintained at more than 80 mm. At about 39 weeks of pregnancy, the amniotic fluid index after ultrasound examination should be maintained between 8 cm and 20 cm. If it is less than 8 cm, it is oligohydramnios, which is not conducive to fetal growth and development and may be normal.