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The ultrasound measurement of the fetal femur length has been proposed as a method for the evaluation of gestational age which might be complementary to or even subsititute for the measurement of the biparietal diameter. In this study a total of 909 ultrasound measurements of the fetal femur length were carried out in 714 pregnancy Korean women, who had regular menstrual cycle, exactly known last menstrual period, no pregnant complications such as intrauterine fetal growth retradation, pregnancy induced hypertention etc. and normal pregnancy outomces, from 13 to 42 week`s gestation, All the patients have delivered babies whose birthweight were within the normal range. the average fetal femur length was slightly less than that of the western average. We calculated the mean and the standard deviation of the femur length for each gestational week, and performed a regression analysis. The results of the analysis were as follows. 1. The linear regression equation of the fetal femur lengths(FL) for the menstrual ages (MA) was, FL=-3.6113 +0.4089(MA) - 0.00337(MA)2 (R2= 0.971, p<0.05) 2. The linear regression equation of the menstrual ages for the fetal femur lengths was, MA=8.8229 + 3.190(FL) + 0.1260(FL)2 (R2= 0.962, p<0.05). The predicted values of the fetal femur length from the menstrual age and the menstrual age from the fetal femur length were respectively calculated with these regression equations.
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