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Table 4 HC reference values for boys and girls from 12 to 40 weeks

From: Sex differences in fetal growth and immediate birth outcomes in a low-risk Caucasian population

GA Boys (HC) Girls (HC)
C5 C10 C50 C90 C95 C5 C10 C50 C90 C95
12 61.3 63.3 70.3 77.4 79.4 61.9 63.6 69.7 76.1 78.1
13 74.4 76.5 83.8 91.1 93.2 74.3 76.1 82.6 89.5 91.6
14 88.2 90.3 97.8 105.3 107.5 87.3 89.2 96.1 103.3 105.4
15 101.9 104.1 111.6 119.2 121.4 100.6 102.6 109.6 117.0 119.2
16 115.2 117.4 124.9 132.6 134.8 113.6 115.6 122.8 130.4 132.6
17 128.0 130.2 137.8 145.6 147.8 126.3 128.3 135.7 143.3 145.6
18 140.3 142.5 150.3 158.2 160.5 138.5 140.7 148.2 156.0 158.3
19 152.2 154.5 162.6 170.7 173.1 150.1 152.3 160.0 168.0 170.4
20 163.4 165.8 174.3 182.9 185.4 160.7 163.0 171.0 179.2 181.6
21 173.9 176.4 185.5 194.6 197.3 171.1 173.4 181.7 190.2 192.8
22 184.2 187.0 196.8 206.6 209.5 181.5 183.9 192.6 201.5 204.2
23 194.8 197.9 208.5 219.1 222.2 191.9 194.5 203.7 213.2 216.0
24 205.6 208.9 220.3 231.6 234.8 202.3 205.1 215.0 225.2 228.3
25 216.2 219.7 231.7 243.6 247.0 212.5 215.5 226.2 237.3 240.6
26 226.8 230.4 242.8 255.0 258.5 222.5 225.8 237.2 249.1 252.7
27 237.4 241.1 253.6 266.0 269.6 232.7 236.1 248.0 260.5 264.2
28 247.7 251.4 264.0 276.5 280.2 243.0 246.4 258.5 271.1 274.8
29 257.1 260.7 273.4 286.2 290.0 252.7 256.1 268.1 280.6 284.3
30 265.3 269.0 282.0 295.1 299.0 261.6 265.0 277.0 289.5 293.2
31 273.0 276.8 290.0 303.7 307.7 269.6 273.1 285.5 298.3 302.1
32 280.2 284.0 297.6 311.9 316.3 276.5 280.2 293.2 306.7 310.8
33 286.5 290.4 304.4 319.4 324.1 282.6 286.4 300.1 314.4 318.7
34 292.1 296.1 310.3 326.0 331.0 288.0 292.0 306.2 321.1 325.5
35 297.7 301.6 315.9 332.2 337.5 292.6 296.7 311.3 326.5 331.0
36 302.9 306.8 321.2 338.2 343.9 296.6 300.7 315.5 330.9 335.5
37 307.3 311.3 326.1 344.1 350.4 301.0 305.2 320.1 335.8 340.4
38 311.9 316.0 331.1 350.4 357.5 306.5 310.7 325.9 341.7 346.4
39 317.3 321.4 336.7 357.1 365.2 312.8 317.1 332.4 348.5 353.3
40 323.5 327.6 342.9 364.2 373.1 319.4 323.7 339.2 355.4 360.2
  1. Reference values in millimeters for fetal head circumference (HC) for boys and girls for each gestational week for the median and 5th, 10th, 90th, and 95th centiles
  2. GA gestational age