Normal Measurements of the Fifth Digit

Ga       (wks)

Percentile (mm)

Mean (mm)

SD    (mm)

10

50

90

15
16
17
18
19
20
21
22
23

5.1
5.6
6.9
7.3
7.8
8.6
9.0
10.4
11.1

5.8
7.3
7.6
8.6
9.0
10.4
11.8
12.2
14.0

6.8
8.6
8.7
10.1
11.9
12.0
12.3
12.9
19.0

5.8
7.2
7.8
8.6
9.4
10.3
11.1
12.0
14.0

0.6
1.0
0.8
1.0
1.5
1.4
1.3
0.9
2.8

 

 

 

REFERENCES

 

Goldstein I, Gomez K, Kopel JA. Fifth digit measurement in normal pregnancies, a potential sonographic sign in Down's syndrome. Ultrasound Obstet Gynecol 1995;5:34-37