
Reference Manual 23
GA (wd) Growth (cm) ±SD (cm) GA (wd) Growth (cm) ±SD (cm)
20w6d 5.12 0.29 36w0d 8.96 0.38
21w0d 5.17 0.29 36w1d 8.98 0.38
21w1d 5.21 0.29 36w2d 9.00 0.38
21w2d 5.26 0.30 36w3d 9.02 0.38
21w3d 5.30 0.30 36w4d 9.04 0.38
21w4d 5.35 0.30 36w5d 9.06 0.38
21w5d 5.39 0.30 36w6d 9.08 0.38
21w6d 5.44 0.30 37w0d 9.10 0.38
22w0d 5.48 0.30 37w1d 9.12 0.38
22w1d 5.52 0.30 37w2d 9.14 0.38
22w2d 5.57 0.30 37w3d 9.15 0.38
22w3d 5.61 0.30 37w4d 9.17 0.38
22w4d 5.66 0.31 37w5d 9.18 0.38
22w5d 5.70 0.31 37w6d 9.20 0.38
22w6d 5.74 0.31 38w0d 9.21 0.38
23w0d 5.79 0.31 38w1d 9.23 0.38
23w1d 5.83 0.31 38w2d 9.24 0.38
23w2d 5.87 0.31 38w3d 9.26 0.39
23w3d 5.92 0.31 38w4d 9.27 0.39
23w4d 5.96 0.31 38w5d 9.28 0.39
23w5d 6.00 0.31 38w6d 9.29 0.39
23w6d 6.05 0.32 39w0d 9.30 0.39
24w0d 6.09 0.32 39w1d 9.31 0.39
24w1d 6.13 0.32 39w2d 9.32 0.39
GA (wd) Growth (cm) ±SD (cm) GA (wd) Growth (cm) ±SD (cm)
24w2d 6.17 0.32 39w3d 9.33 0.39
24w3d 6.22 0.32 39w4d 9.34 0.39
24w4d 6.26 0.32 39w5d 9.35 0.39
24w5d 6.30 0.32 39w6d 9.36 0.39
24w6d 6.34 0.32 40w0d 9.36 0.39
25w0d 6.39 0.32
Biparietal Diameter (BPD) : CHITTY (OUT-IN)
GA Table
Altman DG, Chitty LS: New Charts for ultrasound dating of pregnancy. Ultrasound in
Obstetrics and Gynecology, Vol. 10: 174-191, 1997
BPD (cm) G.A (wd) Min (wd) Max (wd) BPD (cm) G.A (wd) Min (wd) Max (wd)
2.10 12w5d 11w6d 13w5d 5.60 23w1d 21w2d 25w2d
2.20 13w0d 12w1d 14w0d 5.70 23w4d 21w4d 25w4d
2.30 13w2d 12w3d 14w2d 5.80 23w6d 21w6d 26w0d
2.40 13w4d 12w4d 14w4d 5.90 24w1d 22w1d 26w3d
2.50 13w6d 12w6d 14w6d 6.00 24w4d 22w3d 26w6d
2.60 14w1d 13w1d 15w1d 6.10 24w6d 22w5d 27w1d
2.70 14w3d 13w3d 15w3d 6.20 25w2d 23w1d 27w4d
2.80 14w5d 13w4d 15w5d 6.30 25w4d 23w3d 28w0d
2.90 14w6d 13w6d 16w0d 6.40 26w0d 23w5d 28w3d
3.00 15w1d 14w1d 16w2d 6.50 26w2d 24w0d 28w6d
3.10 15w3d 14w3d 16w5d 6.60 26w5d 24w2d 29w1d
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