Amniotic fluid index at 39 weeks of pregnancy

Today we will discuss the problem of oligohydramnios reported by pregnant women during prenatal checkups, especially the amniotic fluid situation near the end of the delivery period, such as after 39 weeks of pregnancy, etc., and focus on explaining the causes of oligohydramnios, including listing several coping situations and treatment plans. We hope that expectant mothers can understand more and spend the ten months of pregnancy with more peace of mind and safety.

The normal value of amniotic fluid at 39 weeks of pregnancy is a maximum depth range of 3-8CM, and the amniotic fluid index range is 5-18CM, which has always been within this range. If the amniotic fluid is too low for more than 41 weeks, induced labor is required. If the amniotic fluid is grade III or symptoms of fetal distress occur and vaginal delivery is not possible in the short term, cesarean section is performed to terminate the pregnancy.

1. What is oligohydramnios

When the amount of amniotic fluid is less than 300 ml at full-term pregnancy, it is called oligohydramnios.

2. Causes of oligohydramnios

1. Fetal malformations: mostly urinary system malformations such as renal dysgenesis, ureteral or urethral atresia, congenital renal agenesis, etc.

2. Post-term pregnancy: the incidence rate is 20% to 30%.

3. Intrauterine growth restriction.

4. Unknown cause: May be related to amniotic lesions. Effects on mother and child

3. How to deal with oligohydramnios

1. To prevent post-term pregnancy, induce labor promptly if pregnancy exceeds 41 weeks.

2. If clinical indication is oligohydramnios and ultrasound shows amniotic fluid index ≤5cm, cesarean section can be performed to terminate the pregnancy after excluding fetal malformation.

3. If the amniotic fluid index is between 5cm-8cm, artificial rupture of membranes can be performed to induce labor and observe the characteristics of the amniotic fluid. If the amniotic fluid is grade III or symptoms of fetal distress occur and vaginal delivery is not possible in the short term, cesarean section can be performed to terminate the pregnancy.

4. Pay attention to changes in amniotic fluid characteristics during delivery and strengthen fetal heart rate monitoring.

At this point, based on the above-mentioned amniotic fluid indicators at 39 weeks of pregnancy and the related analysis of oligohydramnios, it is very important for expectant mothers to pay attention to the amniotic fluid problem in a timely manner and take some preventive measures, such as regular check-ups after 3 months of pregnancy. In addition, planning delivery before 38 weeks, 39 weeks to 40 weeks of pregnancy is also one of the measures to prevent oligohydramnios.