Measure Preset 2-7
Formulae Descriptions Units
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))
g cm
SD=0.146*EFW SD Type=±2SD g g
Shepard
EFW = 10^(-1.7492+ (0.166*BPD)+ (0.046*AC)-
(2.646*AC*BPD/1000))
g cm
SD=0.202*EFW SD Type=±2SD g g
Merz1 EFW=-3200.40479+(157.07186*AC)+(15.90391*(BPD^2)) g cm
Merz2 EFW=0.1*(AC^3) g cm
Hansmann
EFW = (-1.05775*BPD)+ (0.0930707*(BPD^2)+
(0.649145*THD)- (0.020562*(THD^2)+ 0.515263
g cm
Tokyo EFW=(1.07*(BPD^3))+(3.42*APTD*TTD*FL) g cm
Osaka EFW=(1.25674*(BPD^3))+(3.50665*FTA*FL)+6.3 g cm
Campbell EFW = EXP (-4.564+(0.282*AC)-(0.00331* (AC^2))) g cm
Weight Percentile for Age
The Clinical Percentile (CP) and Ultrasound Percentile (UP) will be calculated and displayed in the
report in the following format according to the formula selected for EFW calculation.
z CP(Calc Method)(Formula) ××%: Where Calc Method may be LMP, PRV, IVF, BBT, EDD
and DOC;
z 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; otherwise, the CP will not
be displayed.
average EFW x1.25 > EFW > average EFW x0.75
E.g. EFW-GP(LMP) is EFW Clinical Percentile calculated from the LMP obtained from the
patient information.
Ultrasound Percentile (UP)
It has the same calculation method with CP except to use the ultrasound GA instead of clinical
GA.
E.g. EFW-GP(AUA) and EFW-GP(CUA) is EFW Clinical Percentile calculated from the AUA
and CUA respectively.
2.3.2 Obstetric Preset Operations
2.3.2.1 Basic Procedures
Basic procedures in the OB preset are as follows:
1. Enter the [Setup] -> [System Preset] -> [OB] page.
2. Set the default formula.
a) In the [Fetal Gestational Age], [Fetal Growth] or [Fetal Weight] page, select an OB
Items in the left column.