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CORRELATION BETWEEN FEMUR LENGTH ESTIMATION ON ULTRASONOGRAPHY AND LAST MENSTRUAL PERIOD FOR PREDICTION OF GESTATIONAL AGE DURING THIRD TRIMESTER

Dr Neelam Shehzadi, Dr Saira Saeed, Dr Maham Munir Awan

Background: Childbirth typically occ22urs around 40 weeks from the last menstrual period (LMP). The accurate dating of pregnancy is critically important for pregnancy management from the first trimester to delivery and is particularly necessary for determining viability in premature labor and in postdates deliveries. Femur length measures the longest bone in the body and reflects the longitudinal growth of the fetus. Objective: To determine the correlation between femur length estimation on ultrasonography and last menstrual period for prediction of gestational age during third trimester Material & Methods Study Design: It was cross sectional study Setting: Department of Radiology, Lahore General Hospital, Lahore Duration: 6 months Data collection: 100 pregnant females were enrolled. LMP of female and gestational age was noted. Then females underwent ultrasonography. The femur imaged with a 3.5 MHz curvilinear transducer aligned longitudinally along the thigh. Femur length measured by electronic calipers after clear visualization of the ends of the femoral shaft, femur length was noted. All the collected data was entered and analyzed on SPSS version21. Results: The mean age of females was 29.33±6.79 years, mean BMI was 25.17±5.64 kg/m2. Mean femur length was 31.49±2.427mm and mean gestational age was 32.09±2.33 weeks. A strong positive correlation found between femur length and LMP = r=0.747 (p<0.05). Conclusion: The femur length estimation on ultrasonography had strong correlation with LMP for prediction of gestational age during third trimester. Keywords: Menstrual Period, Gestation, Ultrasonography, Femur Length.

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