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OB Measurements and Formulas
LOGIQ 500 Basic Users Manual
2276612–100 Rev. 0
9–12
USA Method (cont’d)
Calc
Mnemonic
Calc Name
Formula
Author
Reference
CUA**
Composite
Ultrasound
Age
1. CUA(BPD)=9.54+1.482*(BPD)+0.1676*(BPD)^2
2. CUA(HC)=8.96+0.540*(HC)+0.0003*(HC)^3
3. CUA(AC)=8.14+0.753*(AC)+0.0036*(AC)^2
4. CUA(FL)=10.35+2.460*(FL)+0.170*(FL)^2
5. CUA(BPD,AC)=9.57+0.524*(AC)+0.1220*(BPD)^2
6. CUA(BPD,HC)=10.32+0.009*(HC)^2+
1.3200*(BPD)+0.00012*(HC)^3
7. CUA(BPD,FL)=10.50+0.197*(BPD)*(FL)+
0.9500(FL)+0.7300*(BPD)
8. CUA(HC,AC)=10.31+0.012*(HC)^2+0.3850*(AC)
9. CUA(HC,FL)=11.19+0.070*(HC)*(FL)+0.2630*(HC)
10. CUA(AC,FL)=10.47+0.442*(AC)+0.3140*(FL)^2–
0.0121*(FL)^3
11. CUA(BPD,AC,FL)=10.61+0.175*(BPD)*(FL)+
0.2970*(AC)+0.7100*(FL)
12. CUA(HC,BPD,FL)=11.38+0.070*(HC)*(FL)+
0.9800*(BPD)
13. CUA(HC,AC,FL)=10.33+0.031*(HC)*(FL)+
0.3610*(HC)+0.0298*(AC)*(FL)
14. CUA(HC,AC,BPD)=10.58+0.005*(HC)^2+
0.3635*(AC)+0.02864*(BPD)*(AC)
15. CUA(BPD,HC,AC,FL)=10.85+0.060*(HC)*(FL)+
0.6700*(BPD)+0.1680*(AC)
Unit: CUA (week), BPD (cm), HC (cm), AC (cm), FL (cm)
Hadlock,
Radiology, 1984
152:497–501
FL/AC
FL/AC ratio
FL/AC
Hadlock, AJR
141:979, 1983
FL/HC
FL/HC ratio
FL/HC
Hadlock, JUM 3:439,
1984
FL/BPD
FL/BPD ratio
FL/BPD
Hadlock, AJOG
141:759, 1987
CI
Cephalic
Index
BPD/OFD short distance HC/long distance HC
Hadlock, AJR 137:83,
1981
HC/AC
HC/AC ratio
HC/AC
Campbell, BRJ.OG
84:165,1977
** Formulas are used only if Hadlock HC, FL, AC and BPD are used and the
“CUA/AUA
for Hadlock”
preset, found on System Parameters page 3, is set to “CUA”. If other
authors are used, CUA automatically changes to AUA and an average value is displayed.
Table 9–4. OB Calculation Formulas Part 2—USA Version Factory Defaults
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