
Reference Manual 6
OB Reference
Gestational Age Formula and Table List
Abdominal Circumference (AC) : KOREAN
GA Table
Y.G Park.“ The Standardization of Fetal body parts according to the normal Korean Gestational
Age in Ultrasound” Korean Ultrasound Institute, Vol. 14, No.2, 1995
GA = 7.403506 + 0.76191 × AC + 0.004492304 × AC
2
Output Unit : w (weeks)
Input Unit : cm
Min Range : 7.4 cm
Max Range : 35.4 cm
Fetal Growth Table
Y.G Park.“ The Standardization of Fetal body parts according to the normal Korean Gestational
Age in Ultrasound” Korean Ultrasound Institute, Vol. 14, No.2, 1995
AC = 13.554085 x MA - 0.059973 x MA
2
- 94.588168 (Unit: mm)
Output Unit : cm
Input Unit : w (week)
Min Range : 12w
Max Range : 40w
Age (W) Growth (cm) ±SD (cm) Age (W)
Growth
(cm) ±SD (cm)
12 5.932 0.794 32 27.738 0.799
16 10.793 0.728 34 29.578 0.771
20 15.086 0.742 36 31.731 0.583
24 19.300 1.258 38 33.514 0.370
28 23.988 0.870 40 34.490 1.608
Abdominal Circumference (AC) : HADLOCK
GA Table
Hadlock, F., Deter, R.L., Harrist, R.B., Park, S.K. “Estimating Fetal Age: Computer-Assisted
Analysis of Multiple Fetal Growth Parameters” Radiology, 1984, 152: 497-501. (Biometric Age
and Growth Equations)
GA = 8.14 + 0.753 × AC + 0.0036 × AC
2
Output Unit : w (weeks)
Input Unit : cm
Min Range : 4.83cm
Max Range : 38.04 cm
Standard Deviation :
Min (w) Max (w) ±2SD Min (w) Max (w) ±2SD
12 18 1.66 30 36 2.96
18 24 2.06 36 42 3.04
24 30 2.18
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