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Fetal Thoracic Circumference*

 

Age (wk) No. 2.5% 5% 10% 25% 50% 75% 90% 95% 97.5%
 
16 6 5.9 6.4 7.0 8.0 9.1 10.3 11.3 11.9 12.4
17 22 6.8 7.3 7.9 8.9 10.0 11.2 12.2 12.8 13.3
18 31 7.7 8.2 8.8 9.8 11.0 12.1 13.1 13.7 14.2
19 21 8.6 9.1 9.7 10.7 11.9 13.0 14.0 14.6 15.1
20 20 9.5 10.0 10.6 11.7 12.8 13.9 15.0 15.5 16.0
21 30 10.4 11.0 11.6 12.6 13.7 14.8 15.8 16.4 16.9
22 18 11.3 11.9 12.5 13.5 14.6 15.7 16.7 17.3 17.8
23 21 12.2 12.8 13.4 14.4 15.5 16.6 17.6 18.2 18.8
24 27 13.2 13.7 14.3 15.3 16.4 17.5 18.5 19.1 19.7
25 20 14.1 14.6 15.2 16.2 17.3 18.4 19.4 20.0 20.6
26 25 15.0 15.5 16.1 17.1 18.2 19.3 20.3 21.0 21.5
27 24 15.9 16.4 17.0 18.0 19.1 20.2 21.3 21.9 22.4
28 24 16.8 17.3 17.9 18.9 20.0 21.2 22.2 22.8 23.3
29 24 17.7 18.2 18.8 19.8 21.0 22.1 23.1 23.7 24.2
30 27 18.6 19.1 19.7 20.7 21.9 23.0 24.0 24.6 25.1
31 24 19.5 20.0 20.6 21.6 22.8 23.9 24.9 25.5 26.0
32 28 20.4 20.9 21.5 22.6 23.7 24.8 25.8 26.4 26.9
33 27 21.3 21.8 22.5 23.5 24.6 25.7 26.7 27.3 27.8
34 25 22.2 22.8 23.4 24.4 25.5 26.6 27.6 28.2 28.7
35 20 23.1 23.7 24.3 25.3 26.4 27.5 28.5 29.1 29.6
36 23 24.0 24.6 25.2 26.2 27.3 28.4 29.4 30.0 30.6
37 22 24.9 25.5 26.1 27.1 28.2 29.3 30.3 30.9 31.5
38 21 25.9 26.4 27.0 28.0 29.1 30.2 31.2 31.9 32.4
39 7 26.8 27.3 27.9 28.9 30.0 31.1 32.2 32.8 33.3
40 6 27.7 28.2 28.8 29.8 30.9 32.1 33.1 33.7 34.2

Measurements in centimeters

From Chitkara U, Rosenberg J, Chervenak et al. Prenatal sonographic assessment of the fetal thorax: Normal values. Am J Obstet Gynecol 156:1069, 1987.

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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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