.

Objective: This study was performed to construct reference charts for
fetal biometry in Korea, and to compare fetal long bone length of Korea with
other countries in gestation.
Methods: This was a prospective observational study involving 296 single
pregnant women at a gestational age of between 20 and 28 weeks gestation. All
the gestation was confirmed according to last menstrual period and fetal crown-
rump length measurement in the first trimester. No fetuses were excluded on the
basis of abnormal biometry or birth weight. For the purposes of this study, each
woman was scanned once only, and the following fetal biometric measurements were
recorded; biparietal diameter, head circumference, abdominal circumference, and
the lengths of long bones. For each measurement, regression models were fitted
to estimate the mean and standard deviation at each gestational age. We compared
our reference equation with other populations at each gestation Results were
presented graphically across the different gestational ages to allow visual
comparison.
Results: New charts and reference equations for Korean population were
reported for fetal biparietal diameter, head circumference, abdominal
circumference and long bone length. The notable differences in our fetal
biometric measurements compared with those of the European populations were
found for femur length and tibia length.
Conclusion: We presented a new set of reference charts for fetal
biometric measurements and equations for dating of pregnancy in a Korean
population.