Objective: The ratio of fetal femur length and abdominal circumference is one of the important ratios. But we do not have any study on it in our country so far. Therefore a study was conducted to prepare a table based on Bangladeshi population.
Method: Well dated pregnancies with ultrasound confirmed dates were included in a cross-sectional prospective study. By fitting Polynomial regression models to the mean and standard deviations seperately, table and graphs were prepared. Nomograms of Caucasian population which were established before were compared with this study.
Results: A chart of the raw data of 1223 subjects, with superimposed fitted centiles was produced. The quadratic model showed a good fit to the data. 3rd, 10th, 50th, 90th and 97th percentiles, mean and two standard deviations of the data were derived.
Conclusion: These table and graphs can be useful for accurate assessment of fetal femur length/abdominal circumference ratio to detect the type of fetal growth restriction. This study shows that there is similarity of this ratio with the western ratio unlike the individual parameters.

Keywords: Femur length/ abdominal circumference ratio, Bangladesh.