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PREDICTED MENSTRUAL AGE 
FOR FEMUR LENGTHS (1.0 cm - 7.9 cm)

Femur Length
(cm)
Menstrual Age
(wks)
Femur Length (cm) Menstrual Age (wks)
1.0 12.8 4.5 24.5
1.1 13.1 4.6 24.9
1.2 13.4 4.7 25.3
1.3 13.6 4.8 25.7
1.4 13.9 4.9 26.1
1.5 14.2 5.0 26.5
1.6 14.5 5.1 27.0
1.7 14.8 5.2 27.4
1.8 15.1 5.3 27.8
1.9 15.4 5.4 28.2
2.0 15.7 5.5 28.7
2.1 16.0 5.6 29.1
2.2 16.3 5.7 29.6
2.3 16.6 5.8 30.0
2.4 16.9 5.9 30.5
2.5 17.2 6.0 30.9
2.6 17.6 6.1 31.4
2.7 17.9 6.2 31.9
2.8 18.2 6.3 32.3
2.9 18.6 6.4 32.8
3.0 18.9 6.5 33.3
3.1 19.2 6.6 33.8
3.2 19.6 6.7 34.2
3.3 19.9 6.8 34.7
3.4 20.3 6.9 35.2
3.5 20.7 7.0 35.7
3.6 21.0 7.1 36.2
3.7 21.4 7.2 36.7
3.8 21.8 7.3 37.2
3.9 22.1 7.4 37.7
4.0 22.5 7.5 38.3
4.1 22.9 7.6 38.8
4.2 23.3 7.7 39.3
4.3 23.7 7.8 39.8
4.4 24.1 7.9 40.4
VARIABILITY ESTIMATES (+ 2 SD)
12-18 wks + 1.0 wks
18-24 wks + 1.8 wks
24-30 wks + 2.0 wks
30-36 wks + 2.4 wks
36-42 wks + 3.2 wks

From Hadlock FP, et al: Fetal femur length as a predictor of menstrual age: sonographically measured. Amer J Roentgenol 138:875-878, 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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