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PERCENTILE VALUES FOR FETAL HEAD CIRCUMFERENCE

 

Head Circumference (cm)
Menstrual Weeks 3rd 10th 50th 90th 97th
14 8.8 9.1 9.7 10.3 10.6
15 10.0 10.4 11.0 11.6 12.0
16 11.3 11.7 12.4 13.1 13.5
17 12.6 13.0 13.8 14.6 15.0
18 13.7 14.2 15.1 16.0 16.5
19 14.9 15.5 16.4 17.4 17.9
20 16.1 16.7 17.7 18.7 19.3
21 17.2 17.8 18.9 20.0 20.6
22 18.3 18.9 20.1 21.3 21.9
23 19.4 20.1 21.3 22.5 23.2
24 20.4 21.1 22.4 23.7 24.3
25 21.4 22.2 23.5 24.9 25.6
26 22.4 23.2 24.6 26.0 26.8
27 23.3 24.1 25.6 27.1 27.9
28 24.2 25.1 26.6 28.1 29.0
29 25.0 25.9 27.5 29.1 30.0
30 25.8 26.8 28.4 30.0 31.0
31 26.7 27.6 29.3 31.0 31.9
32 27.4 28.4 30.1 31.8 32.8
33 28.0 29.0 30.8 32.6 33.6
34 28.7 29.7 31.5 33.3 34.3
35 29.3 30.4 32.2 34.1 35.1
36 29.9 30.9 32.8 34.7 35.8
37 30.3 31.4 33.3 35.2 36.3
38 30.8 31.9 33.8 35.8 36.8
39 31.1 32.2 34.2 36.2 37.3
40 31.5 32.6 34.6 36.6 37.7

Adapted from Hadlock FP, Deter RL, Harrist RB, Park SK: Estimating fetal age: computer-assisted analysis of multiple fetal growth parameters. Radiology 152:497-501, 1984

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Ultrasound Educational Press     Go Top
Peter W. Callen, M.D.
Professor of Radiology, Obstetrics, Gynecology and Reproductive Science
University of California Medical Center, San Francisco, California

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