
Reference Manual 64
Fetal Growth Table
Jeanty, P., Romero, R. “Obstetrical Ultrasound.” New York, McGraw-hill, 1983, p.192
Age (W)
Growth
(cm)
Min (cm) Max (cm) Age (W)
Growth
(cm)
Min (cm) Max (cm)
14 1.20 0.70 1.70 28 4.60 4.10 5.10
15 1.50 0.90 2.00 29 4.80 4.30 5.30
16 1.70 1.20 2.20 30 5.00 4.50 5.50
17 2.00 1.50 2.50 31 5.20 4.70 5.70
18 2.20 1.70 2.70 32 5.40 4.80 5.90
19 2.50 2.00 3.00 33 5.50 5.00 6.00
20 2.70 2.20 3.30 34 5.70 5.20 6.20
21 3.00 2.50 3.50 35 5.80 5.30 6.40
22 3.20 2.70 3.80 36 6.00 5.50 6.50
23 3.50 3.00 4.00 37 6.10 5.60 6.70
24 3.70 3.20 4.20 38 6.30 5.80 6.80
25 4.00 3.40 4.50 39 6.40 5.90 6.90
26 4.20 3.70 4.70 40 6.60 6.10 7.10
27 4.40 3.90 4.90
Tibia (TIB) : MERZ
GA Table
Merz, E., et al. “Ultrasonic Mensuration of Fetal Limb Bones in the Second and Third Trimesters.”
J Clin Ultrasound 15: 175-183, Table 1, March/April 1987
Tibia
(cm)
GA (wd)
Tibia
(cm)
GA (wd)
Tibia
(cm)
GA (wd)
Tibia
(cm)
GA (wd)
0.90 13w0d 3.00 21w0d 4.60 29w0d 6.10 37w0d
1.00 14w0d 3.20 22w0d 4.80 30w0d 6.20 38w0d
1.30 15w0d 3.60 23w0d 5.10 31w0d 6.40 39w0d
1.60 16w0d 3.70 24w0d 5.20 32w0d 6.50 40w0d
1.80 17w0d 4.00 25w0d 5.40 33w0d 6.60 41w0d
2.20 18w0d 4.20 26w0d 5.70 34w0d 6.80 42w0d
2.50 19w0d 4.40 27w0d 5.80 35w0d
2.70 20w0d 4.50 28w0d 6.00 36w0d
Fetal Growth Table
Merz, E., Grupner, A., Kern, F. “Mathematical Modeling of Fetal Limb Growth.” Journal of
Clinical Ultrasound. 17: 179-185, March/April, 1989.
Age (W)
Growth
(cm)
Min (cm) Max (cm) Age (W)
Growth
(cm)
Min (cm) Max (cm)
12 0.70 0.40 1.00 27 4.50 4.00 4.90
13 1.00 0.60 1.30 28 4.70 4.20 5.10
14 1.20 0.90 1.60 29 4.90 4.40 5.30
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