Obstetrics 5-3
CUA
CUA is calculated according to formulae based on some measurement items (the involved items
are among biparietal diameter (BPD), head circumference (HC), abdomen circumference (AC),
and femur length (FL)). To calculate CUA, all the GA formulae of the parameters involved must be
Hadlock, the unit of the parameters is cm, and unit of CUA is week. The formulae are listed as
follows:
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, HC) = 10.32+0.009*HC
2
+1.3200*BPD+0.00012*HC
3
6. CUA(BPD, AC) = 9.57+0.524*AC+0.1220*BPD
2
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, HC, AC) = 10.58+0.005*HC2
+0.3635*AC+ 0.02864*BPD*AC
12. CUA(BPD, HC, FL) = 11.38+0.070*HC*FL+0.9800*BPD
13. CUA(BPD, AC, FL) = 10.61+0.175*BPD*FL+0.2970*AC+0.7100*FL
14. CUA(HC, AC, FL) = 10.33+0.031*HC*FL+0.3610*HC+0.0298*AC*FL
15. CUA(BPD, HC, AC, FL)=10.85+0.060*HC*FL+0.6700*BPD+0.1680*AC
The default method to calculate CUA is to use the formula that involves more measurement items.
Also, you can select the parameters by clicking the check boxes at the right side of the related
items.
OB Growth Percentile
The obstetric growth percentile is used to estimate the fetal growth. It calculates the difference
between ultrasound measurement results and the measurement results corresponding to the
clinical GA in the FG table. The percentile will not be calculated when there is no clinical GA, or no
FG table, or the SD Type of the FG table is set to “None”.
The premise is: data in the FG table are (approximately) normal distributed, and support “lower-
limit < average value < upper-limit”.
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