Thigh-Calf Circumference

Gestational age
(wks)

Fetal Thigh
Circumference (cm)

Fetal Calf
Circumference (cm)

20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40

6.5 ± 1.3
6.3 ± 0.8
7.8 ± 1.2
7.9 ± 1.4
8.3 ± 1.3
8.6 ± 1.4
9.2 ± 1.3
9.6 ± 1.0
10.3 ± 1.6
10.5 ± 1.3
10.5 ± 1.0
11.3 ± 1.7
12.0 ± 2.8
12.4 ± 1.8
13.5 ± 2.1
13.9 ± 2.4
14.1 ± 2.7
14.2 ± 2.5
14.8 ± 2.0
15.3 ± 2.2
15.7 ± 1.0

4.9 ± 1.5
4.5 ± 1.0
6.0 ± 1.3
6.0 ± 1.3
6.5 ± 0.9
6.6 ± 1.4
7.1 ± 1.1
7.5 ± 1.2
8.1 ± 0.6
8.2 ± 1.7
8.4 ± 0.7
8.9 ± 1.7
9.7 ± 1.0
9.6 ± 1.1
10.5 ± 1.1
10.6 ± 1.0
11.1 ± 1.5
11.0 ± 0.9
11.7 ± 0.6
11.8 ± 0.6
12.1 ± 0.8

* Values are expressed as mean ± 2 SD.
 

 

 

REFERENCES
  1. Vintzileos Am, Neckles S, Campbell WA et.al. Ultrasound fetal thigh-calf circumferences and gestational age - independent fetal ratios in normal pregnancy. J Ultrasound Med 1985;4:287-292.