Nasal bone (NB) calculator
NB – Nasal bone.
Calculator
Gestational age
(GA)
10w
11w
12w
13w
14w
15w
16w
17w
18w
19w
20w
21w
22w
23w
24w
25w
26w
27w
28w
29w
30w
31w
32w
33w
34w
35w
36w
37w
38w
39w
40w
41w
42w
1d
2d
3d
4d
5d
6d
NB
Nasal bone length
, mm
Multiple Pregnancy
?
Singleton
Twins
Triplets
#
NB
Nasal bone length
