This is an automatically translated article.
The article was professionally consulted by Specialist Doctor I Le Hong Lien - Department of Obstetrics and Gynecology - Vinmec Central Park International General Hospital. Doctor Lien has over 10 years of experience as a radiologist in the Department of Ultrasound at the leading hospital in the field of obstetrics and gynecology in the South - Tu Du Hospital. And Master, Doctor Le Nhat Nguyen - Doctor of Obstetrics and Gynecology - Department of Obstetrics and Gynecology - Vinmec Danang International General Hospital. Doctor has more than 20 years of experience in the field of Obstetrics and Gynecology.Amniotic fluid is the environment that helps protect and nourish the fetus during pregnancy. Any change in the amount of amniotic fluid can affect your baby's development. Amniotic fluid index AFI is an important parameter to help identify amniotic fluid abnormalities.
1. What is amniotic fluid?
Thai nhi được bao bọc xung quanh bởi nước ối
Amniotic fluid is made up of three sources: fetus, amniotic membrane and maternal blood.
Amniotic fluid reabsorption: It is done mainly through the fetal digestive system. From the 20th week of pregnancy, the fetus begins to swallow amniotic fluid. In addition, amniotic fluid is also reabsorbed through the fetal skin, the umbilical cord and the amniotic membrane. Thus, right from the beginning of pregnancy, amniotic fluid has the function of nourishing the embryo. After the placenta is formed, the amniotic fluid holds the metabolic fluid and other substances that ensure the survival and development of the fetus. After 34 weeks, the fetus absorbs 300-500ml of amniotic fluid per day. This amount of amniotic fluid into the intestine contributes to the formation of meconium, into the blood contributes to the balance of fluids in the fetus's body and is partially filtered to form urine for the baby.
Mechanically, amniotic fluid creates an environment for the fetus to develop harmoniously and to normalize the position of the fetus in the mother's genital tract in the last months of pregnancy. During labor, amniotic fluid continues to protect the fetus from the trauma of uterine contractions and infection. Amniotic fluid helps to establish the amniotic sac and dilates the mother's cervix, making it easier to clear the cervix. After the rupture of membranes, the oily nature of the amniotic fluid lubricates the mother's genital tract, making it easier for the fetus to be born. Amniotic fluid volume varies according to gestational age: at 8-12 weeks pregnant about 50ml, the maximum amniotic fluid volume is about 1000ml at 28 weeks gestation, then it gradually decreases to 900ml at 36 weeks gestation, at 40 weeks gestation. Amniotic fluid is about 600-800ml per week.
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Các dấu hiệu mang thai sớm không phải chỉ mỗi trễ kinh mà còn có rất nhiều dấu hiệu khác như xuất huyết âm đạo, ngực căng tức,… Điểm xem bạn biết được bao nhiêu dấu hiệu mang thai sớm thông qua bài trắc nghiệm này nhé!
2. What is amniotic fluid function?
The main functions of amniotic fluid include:A buffer to protect the fetus. Prevents adhesion of the amniotic membrane to the embryo. Air conditioning for the fetus. The place where the metabolic products of the embryo are stored. Promote embryo development.
3. What is the Amniotic fluid index (AFI)?
Amniotic fluid index (AFI) is a measure of the amount of amniotic fluid present in a pregnant woman's abdomen at each stage of fetal development. Amniotic fluid index is measured when pregnant women visit the doctor, based on this index, the doctor will tell the mother whether the amount of amniotic fluid is normal or abnormal (polyhydramnios, oligohydramnios, amniotic fluid,...)Measure only Amniotic fluid number AFI: Divide the uterine cavity into 4 parts, the two lines intersect at the belly button of the pregnant woman, measure the depth of the largest amniotic cavity in each chamber and calculate the sum of the above measurements.
Cách đo và tính chỉ số nước ối AFI
4. What does Amniotic fluid index AFI mean for pregnancy?
For pregnancy, amniotic fluid plays an equally important role as the placenta, umbilical cord, and uterus in the role of nourishing and protecting the fetus. In addition to surveying the density and color of amniotic fluid, the amniotic fluid index (AFI) helps doctors predict and predict the health and development status of the baby still in the womb. Ultrasound to measure amniotic fluid index must be evaluated at least 2 consecutive times 2-6 hours apart to determine the status of oligohydramnios or amniotic fluid excess.5. What is the normal AFI amniotic fluid index?
The table below will help pregnant women better understand how much AFI amniotic fluid index is normal and the notes that cannot be ignored if AFI is abnormal:| Chỉ số AFI (cm) | Mức độ | Lưu ý |
| < 3cm | Vô ối | Con sẽ gặp nguy hiểm hơn nếu lượng nước ối rất ít dẫn đến tình trạng thiếu ối, vô ối, thai chết lưu hay sinh non. |
| <= 5cm | Thiểu ối | Thiểu ối gây tăng tỷ lệ bị dị tật bẩm sinh, thai nhi phát triển không được khỏe mạnh. |
| 6 – 12cm | Lượng nước ối bình thường | Mẹ bầu có thể yên tâm với chỉ số này. |
| 12 – 25 cm | Dư ối | Dư ối nằm trong chỉ số này vẫn ở trong hạn mức an toàn, do đó mẹ bầu không cần quá lo lắng. |
| >25cm | Đa ối | Các mẹ nên chú ý sẽ có khả năng ảnh hưởng đến thai, các bà mẹ có khả năng bị vỡ ối sớm, túi ối bị căng, sinh non, gây ra tình trạng nhau bong non, ngôi thai đảo lộn dẫn đến bất thường. |
Therefore, mothers need to have adequate nutrition, reasonable rest, drink enough water every day, have regular antenatal check-ups, do prenatal screening tests as prescribed by the doctor; When there are signs of polyhydramnios or oligohydramnios, it is necessary to closely monitor and treat promptly.
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