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Hadlock Estimated Measurements by Weeks Gestation

 

Expected ultrasound measurements (mm) based on weeks gestation.

Hadlock Formulas: Haddlock Radiology 1984; 152: 497-501



Weeks BPD (mm) HC (mm) AC (mm) FL
(mm)
16 32.3 124.4 99.1 20.5
16.5 34.2 131.2 105.5 22.1
17 36.0 137.9 111.9 23.7
17.5 37.7 144.5 118.2 25.2
18 39.5 151.1 124.5 26.7
18.5 41.3 157.7 130.7 28.3
19 43.0 164.1 136.9 29.8
19.5 44.7 170.5 143.0 31.2
20 46.4 176.8 149.1 32.7
20.5 48.1 183.0 155.1 34.1
21 49.7 189.2 161.1 35.6
21.5 51.4 195.3 167.0 37.0
22 53.0 201.3 172.9 38.4
22.5 54.6 207.2 178.7 39.8
23 56.2 213.0 184.5 41.1
23.5 57.8 218.7 190.2 42.5
24 59.3 224.4 195.9 43.8
24.5 60.8 229.9 201.5 45.1
25 62.3 235.4 207.1 46.4
25.5 63.8 240.8 212.7 47.7
26 65.3 246.0 218.1 48.9
26.5 66.7 251.2 223.6 50.2
27 68.1 256.2 228.9 51.4
27.5 69.5 261.2 234.3 52.6
28 70.8 266.1 239.6 53.8
28.5 72.2 270.8 244.8 55.0
29 73.5 275.5 250.0 56.1
29.5 74.7 280.0 255.1 57.3
30 76.0 284.4 260.2 58.4
30.5 77.2 288.7 265.2 59.5
31 78.4 292.9 270.2 60.6
31.5 79.6 297.0 275.1 61.7
32 80.7 300.9 280.0 62.7
32.5 81.9 304.7 284.8 63.8
33 82.9 308.4 289.6 64.8
33.5 84.0 312.0 294.3 65.8
34 85.0 315.5 299.0 66.8
34.5 86.0 318.8 303.7 67.7
35 87.0 322.0 308.2 68.7
35.5 87.9 325.0 312.8 69.6
36 88.8 327.9 317.3 70.6
36.5 89.7 330.7 321.7 71.5
37 90.5 333.3 326.1 72.3
37.5 91.3 335.8 330.4 73.2
38 92.1 338.2 334.7 74.1
38.5 92.8 340.4 338.9 74.9
39 93.5 342.5 343.1 75.7
39.5 94.2 344.4 347.2 76.5
40 94.8 346.1 351.3 77.3
40.5 95.4 347.7 355.4 78.1
41 95.9 349.2 359.3 78.8
41.5 96.5 350.5 363.3 79.5
42 96.9 351.6 367.2 80.3

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