The biparietal diameter of the fetal head is a data item in B-ultrasound examination, which will be included on the B-ultrasound test sheet. This data is an important indicator of fetal development after pregnancy, which can detect whether the fetus is developing normally. So, what does the biparietal diameter of the fetal head mean?
1. What does fetal biparietal diameter mean
The biparietal diameter of the fetal head refers to the length of the widest part between the left and right sides of the fetal head, also known as the "transverse diameter of the head". The head position indicates that the fetus is facing downwards. FL refers to the length of the femur, which should reach 9.3 centimeters or more at full term in twin pregnancies. According to the general rule, after 5 months of pregnancy, the BPD basically matches the month of pregnancy, which means that at 28 weeks (7 months) of pregnancy, the BPD is about 7.0 centimeters, at 32 weeks (8 months), it is about 8.0 centimeters, and so on. After 8 months of pregnancy, an average weekly growth of about 0.2 centimeters is considered normal. When the expected production date cannot be determined through CRL in the initial stage, it is often predicted through BPD; After the mid-term, when estimating fetal weight, it is often necessary to measure this data.
2. Is the biparietal diameter of the fetal head related to male and female science
Double apical diameter, also known as BPD, is the twin apical diameter of the fetal head. It refers to the length of the widest part between the left and right sides of the fetal head, also known as the "head transverse diameter". Doctors often use it to observe the development of children, determine whether there is a head and pelvis imbalance, and ensure a smooth delivery.
At full term, the fetal biparietal diameter should reach 9.3 centimeters or more. According to the general rule, after 5 months of pregnancy, the BPD basically matches the month of pregnancy, which means that at 28 weeks (7 months) of pregnancy, the BPD is about 7.0 centimeters, at 32 weeks (8 months), it is about 8.0 centimeters, and so on. After 8 months of pregnancy, an average weekly growth of about 0.2 centimeters is considered normal. When the expected production date cannot be determined through CRL in the initial stage, it is often predicted through BPD; After the mid-term, when estimating fetal weight, it is often necessary to measure this data.
Experts remind that using biparietal diameter to determine whether a fetus is male or female is not scientific enough. But using biparietal diameter to calculate fetal weight, the formula is: fetal weight=biparietal diameter * 900-5200 (grams).
Femoral length (FL) is a commonly used indicator by doctors to observe fetal development during prenatal examinations using ultrasound (or color ultrasound).
The femur and humerus are typical long tubular bones in the human body, both of which can be divided into two ends. The femur is the largest long bone in the human body, referring to the thigh bone; The humerus is located in the upper arm, also known as the upper arm bone. As the name suggests, femur length refers to the length of the thigh bone, while humerus length refers to the length of the upper arm bone.
Femoral length and humeral length are both fetal biological indicators for predicting fetal body mass. However, fetal humeral length is superior to femoral length in predicting fetal body mass.
Experts remind that using femur length to determine whether a fetus is male or female is not scientific and unfounded.
The biparietal diameter of the fetal head is an important data, which can clearly determine whether the fetal development is normal or not. It is often closely related to the intellectual development of the fetus. You must understand the significance of this data and learn to read it on the ultrasound chart.
