ABSTRACT
A true estimation of gestational age [GA] plays an important role in quality maternity care and scheduling the labor date. This study aimed to evaluate the normal fetal kidney length [KL] and its correlation with GA. A cross-sectional study on 92 pregnant women between 8[th] and 10[th] week of gestation with normal singleton pregnancy underwent standard ultrasound fetal biometry and kidney length measurement, univariate and multivariate linear regression analysis was used to create a predictive equation to estimate GA on the KL and fetobiometry parameters. A significant correlation was found between GA and KL [r=0.83, P<0.002]. The best GA predictor was obtained by combining head circumference, fetal biparietal diameter, femur length and KL with a standard error [SE] about 14.2 days. Our findings showed that KL measurements combination with other fetal biometric parameters could predict age of pregnancy with a better precision