What is the normal range of amniotic fluid index at 35 weeks?

The development of a baby at 35 weeks is considered very stable. We can clearly see the baby's appearance through B-ultrasound. Many mothers are very concerned about what the normal amniotic fluid index is on B-ultrasound. There are many medical methods to know the amniotic fluid value. Let us learn about the normal range of amniotic fluid index.

1. Direct measurement of amniotic fluid: When the membranes rupture, the standard for diagnosing oligohydramnios is less than 300 ml of amniotic fluid, which is viscous, turbid, and dark green in nature. In addition, multiple round or oval nodules with a diameter of 2-4 mm, light grayish yellow, opaque, and containing stratified squamous epithelial cells and vernix caseosa can often be seen on the surface of the amniotic membrane.

2. B-type ultrasound diagnosis method: In recent years, this method has made great progress in the diagnosis of oligohydramnios, but there are still different opinions on its diagnostic criteria. During the 28th to 40th week of pregnancy, the maximum amniotic fluid pool diameter measured by B-ultrasound is stable in the range of 5.1±2.1cm. Therefore, if the maximum amniotic fluid pool is perpendicular to the uterine contour (AFD) ≤2cm, it is oligohydramnios; ≤1cm is severe oligohydramnios.

3. Amniotic fluid index method: This method is more sensitive and accurate than AFD. AFI ≤ 8.0 cm was used as the critical value for diagnosing oligohydramnios, and ≤ 5.0 cm was used as the absolute value for diagnosing oligohydramnios. In addition to the amniotic fluid pool, B-ultrasound also found that the interface between the amniotic fluid and the fetus was unclear, the fetal surface of the placenta was in obvious contact with the fetal body, and the fetal limbs were squeezed and curled.

Warm reminder: pay attention to rest, moderate activities, and avoid overwork. Eat regularly, maintain a balanced nutrition, maintain a good attitude, avoid excessive mood swings, have regular prenatal checkups, and understand the development of the fetus.

Whether the amniotic fluid index is normal should generally be checked in a regular hospital. If the amniotic fluid is found to be abnormal after the examination, you should listen to the doctor's advice in time, eat more fresh fruits and vegetables, pay more attention to rest, and replenish the protein and vitamins needed by the body and the baby in time, and try to have a reasonable diet and correct work and rest habits.