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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