| |
19 weeks
|
20 weeks
|
21 weeks
|
22 weeks
|
23 weeks
|
24 weeks
|
|---|
|
Nasal bone length
|
0.96
|
0.93
|
0.95
|
0.96
|
0.92
|
0.90
|
|
Biparietal diameter
|
0.94
|
0.99
|
0.98
|
0.99
|
0.99
|
0.97
|
|
Head circumference
|
0.97
|
0.98
|
0.98
|
0.99
|
0.99
|
0.98
|
|
Abdominal circumference
|
1.00
|
0.99
|
0.98
|
0.96
|
0.99
|
0.99
|
|
Femur length
|
0.99
|
0.94
|
0.97
|
0.97
|
1.00
|
0.98
|
|
Tibia length
|
0.98
|
0.97
|
0.97
|
0.98
|
0.99
|
0.97
|
|
Fibula length
|
1.00
|
0.97
|
0.97
|
0.98
|
0.99
|
0.97
|
|
Humerus length
|
0.95
|
0.99
|
0.99
|
0.98
|
0.97
|
0.98
|
|
Radius length
|
0.99
|
0.96
|
0.98
|
0.98
|
0.98
|
0.95
|
|
Ulna length
|
1.00
|
0.99
|
0.99
|
0.99
|
0.99
|
0.97
|
|
Estimated FBW
|
0.97
|
0.96
|
0.96
|
0.94
|
0.97
|
0.99
|
|
UA PI
|
1.60
|
1.06
|
1.04
|
1.06
|
1.06
|
1.06
|
|
UA RI
|
1.22
|
1.05
|
1.03
|
1.03
|
1.01
|
1.03
|
|
MCA PI
|
0.88
|
0.95
|
0.98
|
0.90
|
0.92
|
0.89
|
|
MCA RI
|
0.94
|
1.00
|
0.99
|
0.96
|
0.98
|
0.96
|
|
MCA/UA PI ratio
|
0.61
|
0.93
|
0.99
|
0.88
|
0.99
|
0.99
|
|
MCA/UA RI ratio
|
0.77
|
0.98
|
1.00
|
0.95
|
0.96
|
0.98
|
- FBW, fetal body weight; MCA, middle cerebral artery; MCA/UA PI ratio, ratio of middle cerebral artery resistance index to umbilical artery pulsatility index; MCA/UA RI ratio, ratio of middle cerebral artery resistance index to umbilical artery resistance index; PI, pulsatility index; RI, resistance index; UA, umbilical artery.
