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Many measurements are there for accurate calculation of the gestational age with use of sonography, but the foetal foot length can be used accurately to estimate gestational age. Foetal femur and foot length ratio helps in demarcating the foetuses having short limbs due to dysplasia, from short limbs because of constitutional factors or in utero growth retardation. This study was done to measure the fetal foot length for gestational age and to evaluate fetal femur to foot length ratio in pregnant ladies of 25-36 weeks gestation. Material and Methods: One hundred normal singleton pregnant women of 25-36 weeks gestation were examined for routine obstetrics ultrasound. In these patients foetal foot length and femur length measurements were taken and the gestational age was assessed. In addition, foetal femur length to foot length ratio was calculated in each patient. Results: Pearson’s correlation coefficient value of 0.920 between gestational age and foot length and 0.864 between foot length and femur length with a significance p < 0.001 was obtained. Femur length/ Foot Length ratio was between 0.9 and 1 in all of the cases. Conclusion: There is a linear relationship and good correlation between foot length and gestational age and femur length and foot length. Foetal foot length is other method to measure gestational age. Femur length/ Foot Length ratio is nearly constant during pregnancy. Foetal foot length is a trustworthy method for assessment of gestational age and femur length/ foot length ratio is roughly 1 and a ratio of < 0.92 will be used in finding most cases of dysplasias.

Accuracy of Foetal Foot Length and Femur / Foot Length Ratio in USG Estimation of Gestational Age