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PREDICTED MENSTRUAL AGE FOR HEAD CIRCUMFERENCE MEASUREMENTS (8.5-36.0 CM)

 

Head Circumference (cm)
Menstrual Age
(wks)
Head Circumference (cm)
Menstrual Age
(wks)
8.5
13.7
22.5
24.4
9.0
14.0
23.0
24.9
9.5
14.3
23.5
25.4
10.0
14.6
24.0
25.9
10.5
15.0
24.5
26.4
11.0
15.3
25.0
26.9
11.5
15.6
25.5
27.5
12.0
15.9
26.0
28.0
12.5
16.3
26.5
28.6
13.0
16.6
27.0
29.2
13.5
17.0
27.5
29.8
14.0
17.3
28.0
30.3
14.5
17.7
28.5
31.0
15.0
18.1
29.0
31.6
15.5
18.4
29.5
32.2
16.0
18.8
30.0
32.8
16.5
19.2
30.5
33.5
17.0
19.6
31.0
34.2
17.5
20.0
31.5
34.9
18.0
20.4
32.0
35.5
18.5
20.8
32.5
36.3
19.0
21.2
33.0
37.0
19.5
21.6
33.5
37.7
20.0
22.1
34.0
38.5
20.5
22.5
34.5
39.2
21.0
23.0
35.0
40.0
21.5
23.4
35.5
40.8
22.0
23.9
36.0
41.6
 

VARIABILITY ESTIMATES (+ 2 SD)

12-18 wks
+ 1.3 wks
18-24 wks
+ 1.6 wks
24-30 wks
+ 2.3 wks
30-36 wks
+ 2.7 wks
34-42 wks
+ 3.4 wks

From Hadlock FP, Deter RL, Harrist RB, Park SK: Fetal head circumference: relation to menstrual age. Amer J Roentgenol 138:649, 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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