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PREDICTED MENSTRUAL AGE FOR ABDOMINAL CIRCUMFERENCE MEASUREMENTS (10-36 cm)

Abdominal Circumference (cm) Menstrual Age (wks) Abdominal Circumference (cm) Menstrual Age (wks)
10.0 15.6 23.5 27.7
10.5 16.1 24.0 28.2
11.0 16.5 24.5 28.7
11.5 16.9 25.0 29.2
12.0 17.3 25.5 29.7
12.5 17.8 26.0 30.1
13.0 18.2 26.5 30.6
13.5 18.6 27.0 31.1
14.0 19.1 27.5 31.6
14.5 19.5 28.0 32.1
15.0 20.0 28.5 32.6
15.5 20.4 29.0 33.1
16.0 20.8 29.5 33.6
16.5 21.3 30.0 34.1
17.0 21.7 30.5 34.6
17.5 22.2 31.0 35.1
18.0 22.6 31.5 35.6
18.5 23.1 32.0 36.1
19.0 23.6 32.5 36.6
19.5 24.0 33.0 37.1
20.0 24.5 33.5 37.6
20.5 24.9 34.0 38.1
21.0 25.4 34.5 38.7
21.5 25.9 35.0 39.2
22.0 26.3 35.5 39.7
22.5 26.8 36.0 40.2
23.0 27.3    
 VARIABILITY ESTIMATES (+ 2 SD)
12-18 wks + 1.9 wks
18-24 wks + 2.0 wks
24-30 wks + 2.2 wks
30-36 wks + 3.0 wks
36-42 wks + 2.5 wks

From Hadlock FP, Deter RL, Harrist RB, Park SK: Fetal abdominal circumference as a predictor of menstrual age. AJR 139:367, 1982. Copyright by The American Roentgen Ray Society, 1982.  

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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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