What is the normal range of amniotic fluid index? Amniotic fluid index is an important sign of whether the fetus develops healthily in the mother's stomach. No matter how much or how little, it may have an impact on the fetus. Therefore, it is particularly important for expectant mothers to know the amniotic fluid index, so as to master the relevant standards during inspection and measurement and deal with abnormalities in time. Let's look at the normal range of amniotic fluid index.
What is the normal range of amniotic fluid index? 1 Most hospitals know the amniotic fluid volume by ultrasound, and use amniotic fluid index method to judge 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 up. The total value is in the range of 9 ~ 24cm, the AFI is more than 25cm, oligohydramnios is less than 5cm, and oligohydramnios is less than 8cm.
The normal range of amniotic fluid index is 8-24 cm, with oligohydramnios below 8 cm and polyhydramnios above 24 cm. The amount of amniotic fluid during pregnancy is more than 2000 ml, and the maximum pool depth of amniotic fluid is > 8 cm and the amniotic fluid index is >. 18 cm is called polyhydramnios. The amount of amniotic fluid in the third trimester of pregnancy is less than 300 ml, the maximum pool depth of amniotic fluid is less than 2 cm, and the amniotic fluid index is less than 8 cm, which is called oligohydramnios. If the maximum pool depth of amniotic fluid is ≤ 1 cm, it is called severe oligohydramnios.
Too much or too little amniotic fluid is an abnormal situation, which requires expectant mothers to attach great importance to it. Amniotic fluid is 98% water, with a small amount of inorganic salts, organic hormones and exfoliated fetal cells. Generally speaking, the weight of amniotic fluid will increase with the increase of gestational age, and by 20 weeks, the average is 500 ml. In about 28 weeks, it will increase to 700 ml. The maximum of 32 ~ 36 weeks is about 1000 ~ 1500 ml. Then it gradually decreased. So the clinical normal range is 300 ~ 2000 ml. If it exceeds this range, it is called "polyhydramnios"; if it fails to meet this standard, it is called "oligohydramnios". These two conditions need special attention.
The above is the normal range of amniotic fluid index we introduced to you. During the whole pregnancy, amniotic fluid is very important. Amniotic fluid will be less and less in the third trimester, which may be 1000 ml under normal circumstances. In fact, pregnant women need not worry too much. If the amniotic fluid index is abnormal, the doctor will tell himself, and then everyone can take some first-aid measures.
What is the normal range of amniotic fluid index? 2 amniotic fluid index, the normal range is 8~20 cm. When the amniotic fluid index is less than 5 cm, it is oligohydramnios, and pregnancy should be terminated as soon as possible. Generally speaking, before 28 weeks (7 months) of pregnancy, due to more amniotic fluid, the fetus is smaller, the range of fetal activities in the uterine cavity is larger, and the fetal position is prone to change. After 32 weeks (8 months) of pregnancy, the fetus grows rapidly and the amniotic fluid decreases relatively.
The normal range of amniotic fluid index in each month of pregnancy is as follows:
First month (4 weeks): The brain, eyes, mouth, inner ear, digestive tract, hands and feet of the fetus have been formed. The fetus is about half a centimeter long.
The second month (8 weeks): The face, elbows, knees, fingers and toes of the fetus begin to form, and the bones begin to develop. The fetus has been slightly active, with a body length of about 3 cm and a weight of about1g.
Third month (12 weeks): At this time, the fetus has kicked, clenched fists, turned his head, squinted and frowned in the uterine cavity. Teeth, lips and genitals begin to develop. The fetus is about 9 cm long and weighs about 28 grams. B-ultrasound showed that the biparietal diameter: 3.0-3.2 cm, humerus: 1.03 cm, femur: 1.56 cm, chest circumference: 6.43 cm, abdominal circumference: 7.4 cm, amniotic fluid index: 7.87 cm.
Fourth month (16 weeks): At the pregnant 16 weeks, the hair, eyes, eyelashes and nails of the fetus began to grow, and the vocal cords and taste buds had already grown. The fetus is about 18cm long and weighs 1 13g. B-ultrasound showed that the biparietal diameter was 3.28-3.6 cm, the humerus was 1.75-2.0 cm, the femur was 2.03-2.23 cm, the chest circumference was 8.43 cm, the abdominal circumference was 9.40 cm, and the amniotic fluid index was 10.5 cm.
The fifth month (20 weeks): In the fifth month of pregnancy, the fetal movement began to crack strongly, the fetus had grown hair, sucked the thumb, and the organs of various parts of the body gradually grew. At this time, the fetus is about 25 cm long and weighs 224-500 grams. B-ultrasound showed that the biparietal diameter: 4.47-5.0cm, humerus: 2.57-2.97cm, femur: 3.0 1-3.47cm, chest circumference:1.71-2.
Sixth month (24 weeks): At 24 weeks of pregnancy, the eyes of the fetus can be opened and closed, and the voice inside the mother can be heard. The fetus is 29-30cm long and weighs 680-1000g. B-ultrasound showed that the biparietal diameter: 5.73-6.07cm, humerus: 3.72-4.3cm, femur: 4.2-4.75cm, chest circumference: 14.9- 16.4cm, and abdominal circumference:16.84-64.
Seventh month (28 weeks): At 28 weeks of pregnancy, the fetal weight increases rapidly, which is about twice as much as that at 24 weeks. The skin is red and slightly wrinkled. The weight is about1150g-1800g, and the body length is 35-42cm. B-ultrasound showed that biparietal diameter: 6.64-7.0 1 cm, humerus: 4.39 cm, femur: 5.27 cm, chest circumference: 17.37 cm, abdominal circumference: 19.35 cm, amniotic fluid index:15.
Eighth month (32 weeks): At 32 weeks, the fetus grows up gradually, and the bones, organs and viscera are more mature and strong. At this time, the fetus can already hear sounds outside the mother. It is 42-46 cm long and weighs about 2 -2.7 kg. B-ultrasound showed that the biparietal diameter: 7.79-8. 18cm, humerus: 5.54cm, femur: 6.55cm, chest circumference: 22.3cm, abdominal circumference: 25.36cm, amniotic fluid index: 15- 16cm.
Ninth month (36 -40 weeks): The fetus has reached maturity, the skin is pink, the subcutaneous fat is full, the skin surface is covered with fetal fat, and the fetal head descends into the pelvis. Get ready to be born. At this time, the fetus is 50-55 cm long and weighs about 2.8-3.6 kg. B-ultrasound showed that the biparietal diameter was 8.40-9.3 1cm, the humerus was 5.59-6.29cm, the femur was 6.76-7.62cm, the chest circumference was 23.05-24.32cm, and the abdominal circumference was 25.89-28. 1 1 cm, amniotic fluid index: 15.6- 14.6 cm.