Correlation of Estimated Gestational Age with the Anterior-Posterior Thigh Diameter and Other Parameters of Fetal Biometry

Abstract

Background: Accurate gestational age estimation is vital for tracking pregnancy, identifying growth issues, and guiding clinical decisions. Including anterior-posterior thigh diameter (APTD) in fetal biometry enhances fetal health assessment. Correlating EGA with APTD and other biometry parameters is crucial for evaluating fetal growth and development. This study aimed to evaluate the correlation of estimated gestational age with the anterior-posterior thigh diameter and other parameters of fetal biometry. Methods: This cross-sectional study was conducted at the Department of Radiology and Imaging, Mymensingh Medical College & Hospital, Mymensingh, Bangladesh, from January 2010 to January 2012. A total of 250 healthy women between the 24th and 38th weeks of normal pregnancy were enrolled using a purposive sampling technique. Data analysis was performed using SPSS version 23.0. Results: More than one-third (34.0%) of participants were aged 21-25 years. The mean gestational age was 30.93 ± 4.32 weeks, and over half (56.4%) were primigravida. Significant positive correlations were found between fetal anterior-posterior thigh diameter and gestational age (r=1.0; p<0.001), bi-parietal diameter (r=0.856; p<0.001), head circumference (r=0.962; p<0.001), abdominal circumference (r=0.972; p<0.001), and femur length (r=0.948; p<0.001). Conclusion: The fetal anterior-posterior thigh diameter shows significant positive correlations with several parameters, including gestational age, biparietal diameter, head circumference, abdominal circumference, and femur length in this study.