Based on fetal biparietal diameter (BPD) in the second trimester, pregnancy duration is calculated to be somewhat shorter (mean 280.6 days) [ 3] than previously thought.
Fetal biparietal diameter, abdominal circumference, head circumference, and femur length were measured.
Biparietal diameter, femur length, cardiovascular dimensions, and Doppler velocities through atrioventricular and semilunar valves and the umbilical artery were measured.
Screening at 11-13 withs with ultrasound biparietal diameter (BPD) can detect half of open spina bifida cases.
Good correlation was also observed between ear length and other fetal biometric measurements (biparietal diameter, head circumference, abdominal circumference, femur length, and humerus length).
The equation for the expected median nuchal thickness/humerus length ratio was as follows: 10e(1.7163 – 0.0292) × BPD + 0.0003 × BPD2, where BPD is the biparietal diameter.
Maximal weekly increases occurred at 24 weeks' gestation for head circumference, abdominal circumference, and length of femur and at 26 weeks' gestation for biparietal diameter.
Objective: To establish normal reference intervals for biparietal diameter, head circumference, abdominal circumference, and length of femur, a cross-sectional study.
To establish fetal thyroid nomograms based on gestational age and biparietal diameter and to compare obtained results with previously published data.
In addition, the fetal brain VI, FI and VFI were all significantly correlated with the common fetal growth indices, such as biparietal diameter, occipitofrontal diameter, head circumference, abdominal circumference, femur length and estimated fetal weight.
