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OB Measurements and Formulas
LOGIQ 500 Basic Users Manual
2276612–100 Rev. 0
9–19
Other OB Calculation Formulas (cont’d)
Calc
Mnemonic
Calc Name
Input
Measurements
Formula
Author
Reference
AC
Abdominal
Circumference
circumference by
trace, ellipse, circle
or two distance
Curve data is
available in the
Advanced Reference
Manual
Tokyo Shinozuka Method,
1996
FL
Femur Length
one distance
Manual
CRL
Crown Rump
Length
one distance
EFW1
Estimated
Fetal Weight
four distance
EFW1 [gram] = 1.07 *
BPD^3 +
3.42*APTDxTTD *FL
G = [day] , BPD =
[cm], FL = [cm],
APTDxTTD = [cm2]
EFW2
Estimated
Fetal Weight
2 distance and 1
circumference
EFW2 [gram] = 1.07 *
BPD^3 + 0.30 * AC^2
* FL
G = [day], BPD =
[cm], AC = [cm], FL =
[cm]
EFW3
Estimated
Fetal Weight
four distance
EFW3 [gram] = 1.07 *
BPD^3 +
2.91*APTDxTTD*
LV
G = [day], BPD =
[cm], LV = [cm],
APTDxTTD = [cm2]
BPD
Biparietal
Diameter
one distance
Curve data is
available in the
Advanced Reference
ASUM, D. Robinson et al,
1990.8
CRL
Crown Rump
Length
one distance
Advanced Reference
Manual
ASUM, Silva et al, 1991.6
AC
Abdominal
Circumference
circumference by
trace, ellipse, circle
or two distance
AC (mm) = –56.582 +
11.402 * (GA–2)
GA = [week]
ASUM, Deler
Table 9–6. OB Calculation Formulas—Other Selections (cont’d)
GS Measurement
GS Measurement for the Tokyo University and European
methods requires only one distance measurement.
GS Measurement for the USA method requires 3 distance
measurements obtained from longitudinal and transverse
images. The 3 measurements are anterior–posterior,
transverse and longitudinal. It is advantageous to use the
dual-image (split screen) feature for this GS measurement.
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