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PREDICTED MENSTRUAL AGE FOR BIPARIETAL DIAMETER MEASUREMENTS (2.6 cm - 9.7 cm)

BPD
(cm)
Menstrual Age
(wks)
BPD
(cm)
Menstrual Age
(wks)
2.6
13.9
6.2
25.3
2.7
14.2
6.3
25.7
2.8
14.5
6.4
26.1
2.9
14.7
6.5
26.4
3.0
15.0
6.6
26.8
3.1
15.3
6.7
27.2
3.2
15.6
6.8
27.6
3.3
15.9
6.9
28.0
3.4
16.2
7.0
28.3
3.5
16.5
7.1
28.7
3.6
16.8
7.2
29.1
3.7
17.1
7.3
29.5
3.8
17.4
7.4
29.9
3.9
17.7
7.5
30.4
4.0
18.0
7.6
30.8
4.1
18.3
7.7
31.2
4.2
18.6
7.8
31.6
4.3
18.9
7.9
32.0
4.4
19.2
8.0
32.5
4.5
19.5
8.1
32.9
4.6
19.9
8.3
33.3
4.7
20.2
8.3
33.8
4.8
20.5
8.4
34.2
4.9
20.8
8.5
34.7
5.0
21.2
8.6
35.1
5.1
21.5
8.7
35.6
5.2
21.8
8.8
36.1
5.3
22.2
8.9
36.5
5.4
22.5
9.0
37.0
5.5
22.8
9.1
37.5
5.6
23.2
9.2
38.0
5.7
23.5
9.3
38.5
5.8
23.9
9.4
38.9
5.9
24.2
9.5
39.4
6.0
24.6
9.6
39.9
6.1
25.0
9.7
40.5
VARIABILITY ESTIMATES (+ 2 SD)
12-18 wks
+ 1.2 wks
18-24 wks
+ 1.7 wks
24-30 wks
+ 2.2 wks
30-36 wks
+ 3.1 wks
36-42 wks
+ 3.2 wks

From Hadlock FP, Deter RL, Harris RB, et al: Fetal biparietal diameter: a critical re-evaluation of the relation to menstrual age by means of realtime ultrasound. J Ultrasound Med 1:97-104, 1982.

From Hadlock FP, Deter LR, Harrist RB, et al: 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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