Amniotic fluid index

Amniotic fluid index

We call the amniotic fluid the colorless transparent liquid wrapped around the baby in the womb. Amniotic fluid can protect the fetus from the impact of external forces, at the same time can participate in fetal metabolism, but also protect the mother’s role, reduce the discomfort caused by fetal movement. The amount of amniotic fluid in normal pregnancy increases gradually with the gestational age, generally about 1000 ml at 38 weeks of gestation and 800 ml at term.

Amniotic Fluid Index (AFI): The uterine right angle was divided into four quadrants with umbilical horizontal line and abdominal white line as markers. The vertical diameter of the largest amniotic pool in each quadrant was measured. The sum of the four was amniotic fluid index.

The normal range of amniotic fluid index is 9 to 24cm. AFI (> 25 cm) was diagnosed as oligohydramnios, of which, AFI was mild oligohydramnios at 25-35 cm, moderate oligohydramnios at 36-45 cm, severe oligohydramnios at > 45 cm, oligohydramnios at (< 5 cm) and oligohydramnios at (< 8 cm).

Too much or too much amniotic fluid is abnormal, which requires the attention of expectant mothers.

Normal range of amniotic fluid index

Most hospitals understand the status of amniotic fluid volume by ultrasound, and adopt amniotic fluid index method to determine whether the amniotic fluid volume is normal. The method is: divide the uterus into four quadrants, measure the maximum depth of amniotic fluid in each quadrant, and then add them together. The total value of amniotic fluid index (AFI) > 25 cm was diagnosed as excessive amniotic fluid, less than 5 cm was diagnosed as oligohydramnios and less than 8 cm was diagnosed as oligohydramnios.

Too much or too much amniotic fluid is abnormal, which requires the attention of expectant mothers.

Amniotic fluid index in late pregnancy

It is normal for amniotic fluid index to reach 10-18cm in the third trimester.

The amount of amniotic fluid in normal pregnancy increased with the increase of gestational weeks, and gradually decreased from the last 2 to 4 weeks. The amount of amniotic fluid in full-term pregnancy was about 1000ml (800 to 1200ml).

If oligohydramnios is found in the third trimester of pregnancy, after excluding fetal malformations, the fetal intrauterine condition can be evaluated in detail to promote fetal lung maturation; when the fetus is mature, the pregnancy should be terminated as soon as possible. Termination of pregnancy, can be vaginal induced labor, can also be cesarean section, specific to the fetal and maternal state to choose. In this case, most of them can successfully give birth to a healthy baby.

Polyhydramnios in late pregnancy is a relatively common clinical situation, the occurrence of polyhydramnios in late pregnancy is abnormal. If you are diagnosed with excessive amniotic fluid, your doctor will ask you to do a high-definition B-ultrasound to see if the fetus is malformed. Doctors may also make you do amniocentesis to see if the fetus has genetic defects. During your delivery, doctors will closely monitor your situation. Owing to excessive amniotic fluid, the risk of umbilical cord prolapse (when the umbilical cord comes out of the cervical orifice) or placental abruption is also higher. These two situations require immediate cesarean section (cesarean section).