Where is the Femur Located?
During a certain stage of pregnancy, ultrasound examination is required to measure the femur length of the fetus. The femur length can provide information about the fetal development and whether the fetus is healthy. It is also a basis for calculating the fetal weight during pregnancy. As the pregnancy months increase, the femur length also increases, indicating that the fetal weight and height are also increasing. So, where is the femur located? Let's take a look below.
The femur (femur) and humerus (humerus) are typical long tubular bones in the human body and can be divided into one body and two ends. The femur is the largest long bone in the human body, referring to the thigh bone; while the humerus is located in the upper arm, also known as the upper arm bone. Therefore, as the name suggests, the femur length refers to the length of the thigh bone, and the humerus length refers to the length of the upper arm bone. Both femur length and humerus length are fetal biometric indicators used to predict fetal body mass. However, the humerus length is superior to the femur length in predicting fetal body mass.
The femur length is also one of the important data for calculating fetal weight during pregnancy. As the gestational weeks increase, the value of femur length gradually increases, indicating that the fetal length and weight are gradually increasing. In the middle and late stages of pregnancy, due to the large movement of the fetus in the mother's abdomen, different fetal positions, and differences in doctors' operations, there may be digital errors, and sometimes the fluctuations can be significant. After 30 weeks, there may be a two-week error margin. Therefore, when pregnant women see discrepancies between the report results and normal values, they should not be too nervous. If there are indeed issues after a re-examination, they should consult an expert for solutions.
Biparietal diameter (BPD) is a fetal development indicator that represents the diameter measurement across the fetal head. It is one of the indicators used to estimate the size of the fetus. Generally, the BPD is approximately 20 (±4.0) mm at 3 months of pregnancy, 36 (±5.0) mm at 4 months, 47 (±4.0) mm at 5 months, 60 (±6.0) mm at 6 months, 72 (±4.0) mm at 7 months, 81 (±4.0) mm at 8 months, 90 (±6.0) mm at 9 months, and 96 (±8.0) mm at 10 months of pregnancy.
