2-6 Measure Preset
Tools GA FG
TCD
Hill
Nicolaides
Hill
Goldstein
Nicolaides
OOD Jeanty /
Vertebrae / /
NT / /
Cist Magna / Nicolaides
Mean Sac Diam Daya /
MCA PI / JSUM
MCA RI / JSUM
Umb A PI / JSUM
Umb A RI / JSUM
AFI / Moore
FL/HC (Hadlock) / Hadlock
HC/AC(Campbell) / Campbell
Fetal Weight Formulae
EFW is a calculation item. If all tools required for EFW formula have been performed, EFW will be
obtained automatically. The system will recalculate the EFW after new measurements are
completed.
Tips: Formulae of EFW and EFW2 of GA/ FG are different from those in the [Fetal Weight]
page.
EFW formulae of GA/ FG are used to perform the GA calculation or the Fetal Growth
Curve based on EFW.
EFW formulae in the [Fetal Growth] page are used in EFW calculation based on
some OB measure results (e.g. AC).
The Fetal Weight formulae are shown in the following table:
Formulae Descriptions
Units
EFW Item
Hadlock
(AC, FL)
EFW= 10^(1.304+ (0.05281*AC)+ (0.1938*FL)- (0.004*AC*FL)) g cm
SD=0.154*EFW SD Type=±2SD g g
Hadlock
(AC, FL,
BPD)
EFW= 10^(1.335 -(0.0034*AC*FL) + (0.0316*BPD) +
(0.0457*AC) + (0.1623*FL))
g cm
SD=0.146*EFW SD Type=±2SD g g
Hadlock
(AC, FL,
HC)
EFW= 10^(1.326-(0.00326*AC*FL)+ (0.0107*HC)+
(0.0438*AC)+ (0.158*FL))
g cm
SD=0.148*EFW SD Type=±2SD g g
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