11 - 22 Operator’s Manual
11 Measurement and Report
EFW is a calculation item. If all tools required for the EFW formula have been performed,
EFW will be obtained automatically. The system will recalculate the EFW after new
measurements are completed.
The Fetal Weight formulae are shown in the following table
:
Weight Percentile for Age
The Clinical Percentile (CP) and Ultrasound Percentile (UP) is calculated and displayed in the
report in the following format according to the formula selected for EFW calculation.
CP (Calc Method) (Formula) ××.××%: Where Calc Method may be LMP, PRV, IVF, BBT, DOC
and EDD.
UP (Calc Method) (Formula) ××.××%: Where Calc Method may be AUA, CUA.
• Clinical Percentile (CP)
Find the average value and calculate the threshold range in the formula (to calculate EFW) in
the FG table according to the clinical GA (obtained in patient information such as LMP, IVF).
If the actual EFW value is in the following range, keep calculating. If not, the CP will not be
displayed.
Formulae Descriptions Units
EFW Item
Hadlock (AC,
FL)
EFW= 10^(1.304+ (0.05281×AC)+ (0.1938×FL)-
(0.004×AC×FL))
gcm
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))
gcm
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))
gcm
SD=0.148×EFW SD Type=±2SD g g
Hadlock (AC,
FL, HC, BPD)
EFW= 10^(1.3596- (0.00386×AC×FL)+ (0.0064×HC)+
(0.00061×BPD×AC)+ (0.0424×AC)+ (0.174×FL))
gcm
SD=0.146×EFW SD Type=±2SD g g
Shepard (AC,
BPD)
EFW = 10^(-1.7492+ (0.166×BPD)+ (0.046×AC)-
(2.646×AC×BPD/1000))
kg cm
SD=0.202×EFW SD Type=±2SD g g
Merz1 (AC,
BPD)
EFW=-3200.40479+(157.07186×AC)+(15.90391×(BPD^2)) g cm
Merz2 (AC) EFW=0.1×(AC^3) g cm
Hansmann (BPD,
THD)
EFW = (-1.05775×BPD)+ (0.0930707×(BPD^2))+
(0.649145×THD)- (0.020562×(THD^2))+ 0.515263
kg cm
Tokyo (BPD,
APTD, TTD, FL)
EFW=(1.07×(BPD^3))+(3.42×APTD×TTD×FL) g cm
Osaka (FL, BPD,
FTA)
EFW=(1.25674×(BPD^3))+(3.50665×FTA×FL)+6.3 g cm
Campbell (AC) EFW = EXP (-4.564+(0.282×AC)-(0.00331× (AC^2))) kg cm
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