Amniotic fluid depth standard at 39 weeks of pregnancy

As we all know, the fetus is wrapped in amniotic fluid when it is in the mother's body. The amniotic fluid serves as a connecting substance between the mother and the fetus to carry various substances. The nutrients needed by the fetus and the waste produced can be exchanged with the mother through the amniotic fluid. There is actually a normal standard for the depth of amniotic fluid. In the late pregnancy, at 39 weeks, the amount of amniotic fluid will gradually decrease, and the normal depth of amniotic fluid is about 3-7 cm.

In the late pregnancy, the depth of amniotic fluid is normal between 3-7 cm. If it exceeds 7 cm, it means that the amniotic fluid is increased. The normal amniotic fluid volume is 8-20cm. When the amniotic fluid index is less than 5cm, it means there is too little amniotic fluid and the pregnancy should be terminated as soon as possible. In most cases, oligohydramnios in the late pregnancy is caused by placental dysfunction. Abnormal development of the urinary system can also cause oligohydramnios, but it is rare and can sometimes be detected by B-ultrasound examination. In the late stages of pregnancy, the umbilical cord cannot be turned around the neck and a cesarean section must be performed on the doctor's advice.

In the late pregnancy, the amniotic fluid can reach 1000 ml. In the last 2 to 4 weeks of pregnancy, the amount begins to decrease, and can be reduced to 550 in post-term pregnancy. Any amount exceeding 2000 during pregnancy is called polyhydramnios, and any amount less than 300 in the late pregnancy is called oligohydramnios.

The amount of amniotic fluid gradually increases as the fetus grows. When the fetus is 38 weeks old, the amount of amniotic fluid reaches its peak, averaging about 1000 ml, and then gradually decreases to an average of about 800 ml at 40 weeks. If the amount of amniotic fluid exceeds 2000 ml at any time during pregnancy, it is called polyhydramnios.

Due to excessive amniotic fluid, the mother often feels that her abdomen is growing abnormally rapidly, and she will experience symptoms such as palpitations, shortness of breath, and swelling of the lower limbs; the fetus floats in the water and it is difficult to "reach the shore." Although excessive amniotic fluid is not a good thing, there is no need to be nervous. Some detection methods, such as ultrasound examination, can detect excessive amniotic fluid at a glance, detect it early, and take timely measures.

The amniotic fluid depth refers to the vertical depth of the largest amniotic fluid pool indicated by B-ultrasound examination. Less than 2 cm indicates too little amniotic fluid, and greater than 8 cm indicates too much amniotic fluid. It is a medical term and an important indicator for determining the amount of amniotic fluid. If there is more amniotic fluid, the fetus can grow healthily; if there is less amniotic fluid, it can cause meconium accumulation during the fetal delivery period, or even premature birth or suffocation. Ultrasound examination shows the vertical depth of the largest amniotic fluid pool. A depth of 3-8cm is considered normal. A value less than 3 cm indicates oligohydramnios, while a value greater than 8 cm indicates polyhydramnios.