Chonnam Med J.  1997 Dec;33(2):233-246.

Ultrasonic Measurement of Korean Fetal Growth Parameters by Gestational Age in the Normal Singleton Pregnancy

• Song TB
• Kim YH
• Kim EK

Abstract

Ultrasonography is the most accurate method in the evaluation of fetal growth parameters and in the determination of fetal gestational age. The accurate estimation of gestational age and fetal size is an essential part of pregnancy management. Antenatal ultrasonographic measurements of femur length, biparietal diameter, head circumference, abdominal circumference, and crown-rump length were analysed to get the mean value and percentiles at each gestational weeks and the predicted gestational age for the above fetal growth parameters in singleton normal pregnancy. Pregnancy with congenital malformation, hypertension, diabetes mellitus, and other medical or obstetric complications which can affect fetal growth was excluded. The study period was from January 1991 to December 1996 at the Chonnam University Hospital. The results were as follows. 1. The second order regression equation had greater r2 value than that of the first order regression equation at the all growth parameters. 2. The linear quadratic regression equation of the femur length for gestational age was FL=-38.4567+4.3178(GA)-0.0381(GA)2 (r2=0.9765, p=0.0001). 3. The linear quadratic regression equation of the biparietal diameter for gestational age was BPD=-36.1332+5.3002(GA)-0.0516(GA)2 (r2=0.9781, p=0.0001). gestational age was HC=-144.1252+20.6486(GA)-0.2203(GA)2 (r2=0.9733, p=0.0001). 5. The linear quadratic regression equation of the abdominal circumference for gestational age was AC=-97.2196+14.4129(GA)-0.0832(GA)2 (r2=0.9667, p=0.0001). 6. The linear quadratic regression equation of the crown-rump length for gestational age was CRL=-24.1200+2.505(GA)+0,3488(GA)2 (r2=0.8663, p=0.0001). 7. The femur length, biparietal diameter, head circumference, and abdominal circumference showed delayed growth after 38 weeks of gestation with considerable error in predicting gestational age by regression equation.

Keyword

Ultrasonography; Fetus; Growth parameters; Regression analysis

MeSH Terms

Crown-Rump Length
Diabetes Mellitus
Femur
Fetal Development*
Fetus
Gestational Age*
Head
Hypertension
Jeollanam-do
Pregnancy*
Regression Analysis
Ultrasonics*
Ultrasonography