
Reference Manual 16
Biparietal Diameter (BPD) : 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 = 9.54 + 1.482 × BPD + 0.1676 × BPD
2
Output Unit : w(weeks)
Input Unit : cm
Min Range : 1.36 cm
Max Range : 10.18 cm
Standard Deviation :
Min Range(w) Max Range(w) ±2SD(w)
12 18 1.19
18 24 1.73
24 30 2.18
30 36 3.08
36 42 3.20
Fetal Growth 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.
Equation = 0.41 x MA – 0.000061 x MA
3
– 3.08
Output Unit : cm
Input Unit : w(weeks)
Min Range : 12 w
Max Range : 40 w
Standard Deviation : 2SD = 0.6 cm
Min Range (cm) Max Range (cm) SD (cm)
0 100 0.6
Biparietal Diameter (BPD) : MERZ
GA Table
E. Merz, W. Goldhofer, E. Timor-Tritsch “Ultrasound in Gynecology and Obstetrics” Textbook
and Atlas, 1991 Georg Thieme Verlag, 308-338
BPD (cm) GA (wd) Min (wd) Max (wd) BPD (cm) GA (wd) Min (wd) Max (wd)
2.10 12w1d 10w5d 13w5d 6.20 24w1d 22w1d 26w1d
2.20 12w3d 10w6d 13w6d 6.30 24w4d 22w4d 26w4d
2.30 12w5d 11w1d 14w1d 6.40 24w6d 22w6d 26w6d
2.40 13w0d 11w4d 14w4d 6.50 25w1d 23w1d 27w1d
2.50 13w1d 11w5d 14w5d 6.60 25w4d 23w4d 27w4d
2.60 13w4d 12w0d 15w0d 6.70 25w6d 23w6d 27w6d
2.70 13w6d 12w1d 15w3d 6.80 26w1d 24w1d 28w2d
2.80 14w1d 12w4d 15w5d 6.90 26w4d 24w3d 28w4d
2.90 14w2d 12w5d 15w6d 7.00 26w6d 24w5d 28w6d
3.00 14w4d 13w0d 16w1d 7.10 27w1d 25w1d 29w2d
3.10 14w6d 13w2d 16w4d 7.20 27w4d 25w4d 29w5d
3.20 15w1d 13w4d 16w6d 7.30 27w6d 25w6d 30w0d
3.30 15w3d 13w6d 17w0d 7.40 28w2d 26w1d 30w3d
3.40 15w5d 14w0d 17w3d 7.50 28w4d 26w4d 30w5d
3.50 16w0d 14w2d 17w5d 7.60 29w0d 26w6d 31w1d
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