Reference charts and equations of Korean fetal biometry

Objective To construct new reference charts and equations for fetal biparietal diameter (BPD), head circumference (HC), abdominal circumference (AC) and femur diaphysis length (FDL) from Korean fetuses at 12-40 weeks. Method Prospective cross-sectional data obtained in one center for 5 years from a population of pregnant women undergoing ultrasound examination between the 12th and 40th week of gestation. Exclusion criteria comprised all maternal and fetal conditions possibly affecting fetal biometry. No fetuses were excluded on the basis of abnormal biometry. For each measurement, regression models were fitted to estimate both the mean and the standard deviation at each menstrual age. Results Biometric measurements were obtained for 10455 fetuses. New charts and reference equations are reported for BPD, HC, AC and FDL. Reference equations are cubic models. Conclusion We present new Korean reference charts and equations for fetal biometry. They can be easily used in obstetric ultrasound studies for the Korean population. Copyright (c) 2007 John Wiley & Sons, Ltd.