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APPENDIX III: Sonographic Measurements of the Embryo and Fetus

TABLE III-1Mean Gestational Sac Diameter and Crown-Rump Length and Corresponding Menstrual Age
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TABLE III-1Mean 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 0.4
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

From Daya, 1991; Hadlock, 1992; Nyberg, 1987; Robinson; 1975.

TABLE III-2Fetal Weight Percentiles According to Gestational Age
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TABLE III-2Fetal Weight Percentiles According to Gestational Age
Gestational Age (wk) Fetal Weight Percentiles (g)
3rd 10th 50th 90th 97th
10 26 29 35 41 44
11 34 37 45 53 56
12 43 48 58 68 73
13 54 61 73 85 92
14 69 77 93 109 117
15 87 97 117 137 147
16 109 121 146 171 183
17 135 150 181 212 227
18 166 185 223 261 280
19 204 227 273 319 342
20 247 275 331 387 415
21 298 331 399 467 500
22 357 397 478 559 599
23 424 472 568 664 712
24 500 556 670 784 840
25 586 652 785 918 984
26 681 758 913 1068 1145
27 787 876 1055 1234 1323
28 903 1005 1210 1415 1517
29 1029 1145 1379 1613 1729
30 1163 1294 1559 1824 1955
31 1306 1454 1751 2048 2196
32 1457 1621 1953 2285 2449
33 1613 1795 2162 2529 2711
34 1773 1973 2377 2781 2981
35 1936 2154 2595 3026 3254
36 2098 2335 2813 3291 3528
37 2259 2514 3028 3542 3797
38 2414 2687 3236 3785 4058
39 2563 2852 3435 4018 4307
40 2700 3004 3619 4234 4538
41 2825 3144 3787 4430 4749
42 2935 3266 3934 4602 4933

Reproduced with permission from Hadlock, 1991.

TABLE III-3Smoothed Birth Weight Percentiles for Twins with Dichorionic Placentation
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TABLE III-3Smoothed Birth Weight Percentiles for Twins with Dichorionic Placentation
...
GA (wk) Smoothed Birth Weight Percentiles
5th 10th 50th 90th 95th
23  477  513  632  757  801
24  538  578  712  853  903
25  606  652  803  962 1018
26  684  735  906 1085 1148
27  771  829 1021 1223 1294
28  870  935 1152 1379 1459
29  980 1054 1298 1554 1645
30

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