BACKGROUND Accurate gestational age assessment is of great importance in obstetric practice. Ultrasound is an accurate and useful modality for the assessment of gestational age which can greatly impact obstetric management and improve antepartum care. We wanted to evaluate the association of foetal biometric indices and kidney length with gestational age. METHODS The present study was conducted over a period of 18 months among 266 women in the age group of 18-32 years with uncomplicated

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... y who underwent ultrasound evaluation in the Department of Obstetrics and Gynaecology. Routine foetal parameters were obtained along with detailed clinical history. RESULTS There was no correlation between foetal KL and mother's height, weight, BMI, parity, or occupation. A significant correlation was found between gestational age and kidney length (r=0.84, p<0.001). CONCLUSIONS Kidney length is easy to identify and measure. Routine foetal biometric with FRL results in accurate estimation of gestational age. Hence, it can be incorporated in routine antenatal ultrasound in general population.