This is an automatically translated article.
The article was professionally consulted with Specialist Doctor Obstetrician and Gynecologist - Department of Obstetrics and Gynecology - Vinmec Hai Phong International General Hospital.
In case the biparietal diameter has a larger head than normal if delivered vaginally, it can be dangerous for both mother and baby during childbirth. However, to measure more accurately, doctors will combine measuring biparietal diameter index with other fetal indicators such as: Abdominal circumference, femur length,...
1. What is the biparietal diameter?
During pregnancy, weight and biparietal diameter are one of the important indicators to be measured during ultrasound. Thanks to the biparietal diameter index, it is possible to know the growth, weight and size of the fetus before birth.
Biparietal diameter is the cross-sectional diameter of the skull, also known as the fetal head circumference. By ultrasound, the diameter was measured at the largest cross-section of the fetal skull.
Biparietal diameter index should be measured between 13th and 20th week of pregnancy and from 20th week onwards it is still measured but not effective anymore because this index has gradually lost its accuracy. exactly. Therefore, pregnant women should pay attention to the antenatal check-up according to the doctor's appointment so as not to miss this important milestone.
2. What does biparietal diameter mean for mother and baby?
Through fetal ultrasound, measuring biparietal diameter is extremely important, because it can show fetal development such as:
Indicate weight, gestational age, brain health status as well as like the baby's development. Not only reflecting the level of fetal development, biparietal diameter also determines the type of normal delivery or caesarean section of pregnant women. However, there are also some pregnant women who do not know how much biparietal diameter index is normal. In fact, this index before the day the fetus is about to be born will be between 88mm - 100mm. In case the biparietal diameter index is smaller or higher than normal, it may be due to:
The fetal biparietal diameter is too small: There is a possibility that the baby has microcephaly, the baby's brain is compressed causing The damage leads to the failure to develop normally. When suffering from this disease, the baby will be born with mental and motor retardation. The fetal biparietal diameter is higher than the norm: This case, can be seen in mothers who are pregnant with a second child or have gestational diabetes, so there is a higher chance of having a cesarean section.
Based on biparietal diameter, we can calculate fetal weight by the following 2 formulas:
Weight (grams) = [BPD (mm) – 60] x 100 Weight (grams) = 88.69 x BPD (mm) – 5062
3. What is the biparietal diameter to have surgery?
If the fetal biparietal diameter index is not within the normal range, but higher or lower, the doctor may ask the pregnant woman to conduct another ultrasound or perform further tests and examinations.
In case the biparietal diameter has a larger head than normal, if delivered vaginally, it can be dangerous for both mother and baby during childbirth. However, to measure more accurately, doctors will combine measuring biparietal diameter index with other fetal indicators such as: waist circumference, femur length,...
So the biparietal diameter how much to have surgery? If the ultrasound shows that the biparietal diameter of the fetus is higher than 88-100 mm, the doctor may order a cesarean section to ensure the safety of mother and baby.
Biparietal diameter index is not accurate in the later stages of pregnancy, but it does help pregnant women to make a general assessment of fetal development. Therefore, during antenatal care, pregnant women should not ignore this information and other indicators.
3 The second trimester of pregnancy is a period of strong fetal growth. Pregnant women need:
Comprehensive fetal malformation screening by superior 4D ultrasound technique. Screening for gestational diabetes, avoiding many dangerous complications for both mother and baby. Control the mother's weight reasonably to assess the health status of the pregnant woman and the development of the fetus. Understand the signs of threatened early delivery (especially in those carrying multiple pregnancies or having a history of miscarriage or premature birth) so that they can receive timely treatment to maintain pregnancy. To protect mother and baby during pregnancy, Vinmec provides a comprehensive Maternity service to monitor the health status of mother and baby, periodical antenatal check-ups with leading Obstetricians and Gynecologists. enough tests, important screening for pregnant women, counseling and timely intervention when detecting abnormalities in the health of mother and baby.
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