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APPENDIX III: Fetal Sonographic Measurements

TABLE III-1Mean Gestational Sac Diameter and Crown-Rump Length and Corresponding Menstrual Age
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TABLE III-1 Mean Gestational Sac Diameter and Crown-Rump Length and Corresponding Menstrual Age
Menstrual Age (day) Menstrual Age (wk) Gestational Sac Size (mm) Crown-Rump Length (cm)
30 4.3
32 4.6 3
34 4.9 5
36 5.1 6
38 5.4 8
40 5.7 10 0.2
42 6.0 12 0.35
44 6.3 14 0.5
46 6.6 16 0.7
48 6.9 18 0.9
50 7.1 20 1.0
52 7.4 22 1.2
54 7.7 24 1.4
56 8.0 26 1.6
58 8.3 27 1.8
60 8.6 29 2.0
62 8.9 31 2.2
64 9.1 33 2.4
66 9.4 35 2.6
68 9.7 37 2.9
70 10.0 39 3.1
72 10.3 41 3.4
74 10.6 43 3.7
76 10.9 45 4.0
78 11.1 47 4.2
80 11.4 49 4.6
82 11.7 51 5.0
84 12.0 53 5.4

Data from Nyberg, 1992; Hadlock, 1992; Robinson; 1975; Daya, 1991.

TABLE III-2Mean Gestational Age Percentiles Corresponding to Crown-Rump Length (CRL) Measurements
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TABLE III-2 Mean Gestational Age Percentiles Corresponding to Crown-Rump Length (CRL) Measurements
Gestational Age (wk) Gestational Age (wk)
CRL (mm) Percentile CRL (mm) Percentile
5th 50th 95th 5th 50th 95th
10 6 + 5 7 + 3 8 30 9 + 5 10 + 2 11
11 6 + 6 7 + 4 8 + 2 31 9 + 5 10 + 3 11 + 1
12 7 + 1 7 + 5 8 + 3 32 9 + 6 10 + 4 11 + 2
13 7 + 2 8 8 + 4 33 10 10 + 5 11 + 2
14 7 + 3 8 + 4 8 + 6 34 10 + 1 10 + 6 11 + 3
15 7 + 4 8 + 2 9 35 10 + 2 10 + 6 11 + 4
16 7 + 5 8 + 3 9 + 1 36 10 + 2 11 11 + 5
17 8 8 + 4 9 + 2 37 10 + 3 11 + 1 11 + 6
18 8 + 1 8 + 5 9 + 3 38 10 + 4 11 + 2 11 + 6
19 8 + 2 8 + 6 9 + 4 39 10 + 5 11 + 2 12
20 8 + 3 9 9 + 5 40 10 + 5 11 + 3 12 + 1
21 8 + 4 9 + 1 9 + 6 41 10 + 6 11 + 4 12 + 1
22 8 + 5 9 + 2 10 42 11 11 + 4 12 + 2
23 8 + 6 9 + 3 10 + 1 43 11 11 + 5 12 + 3
24 8 + 6 9 + 4 10 + 2 44 11 + 1 11 + 6 12 + 3
25 9 9 ...

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