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OB Measurements and Formulas
LOGIQ 500 Basic Users Manual
2276612–100 Rev. 0
9–7

Tokyo University Method (cont’d)
Calc
Mnemonic Calc Name Input Measurements Formula
Author
Reference
HR Heart Rate
(beats/minute) one 2 beat time
(measured manually or
automatically) HR[BPM]=
120[sec]/
2beat time[sec] n/a
GS Gestational Sac one distance Curve data is available
in the Advanced Tokyo University
Method 1986
CRL Crown Rump
Length one distance
in the Advanced
Reference Manual Method 1986,
6 by Univ. of
Tokyo
FL Femur Length one distance
y
BPD Biparietal
Diameter one distance
LV Length of Vertebra one distance
APTD Antero posterior
Trunk Diameter one distance APTD = input
TTD Transverse Trunk
Diameter one distance TTD = input
EFBW Estimated Fetal
Body Weight Average of BPD, Average
of APTD, Average of TTD
and Average of FL EFBW = 1.07 x
BPD^ 3 +3.42 x APTD
x TTD x FL
CTAR Cardio–Thoracic
Area Ratio four distances or two
areas CTAR =
(d1 x d2) / (d3 x d4) x
100 or a1 / a2 x 100 Y.Chiba Fetal
Diagn Ther 1990 :
5 : 175 – 188
PLI Preload Index two Doppler blood flow
velocities PLI = | v1 / v2 | Y.Chiba Fetal
Diagn Ther 1990 :
5 : 168 – 174
EF Ejection Fraction two distances on M-Mode
(End-diastolic dimension
and End-systolic
dimension on M-Mode) EF = (1 – Ds^3 / Dd^3) n/a
Vmax Maximum Velocity
in descending
aorta one Doppler blood flow
peak velocities Vmax = input n/a
S/D Ratio Systolic / Diastolic
Ratio two Doppler blood flow
peak velocities S/D = Vsystole /
Vdiastole
*NOTE*
n/a
A/B Ratio Velocities Ratio two Doppler blood flow
peak velocities A/B = V
1
/V
2
n/a
Pl Pulsatility Index two Doppler blood flow
peak velocities and
TA_MAX Pl = (Vmax – V
diastole
)/
TA_MAX
*NOTE*
n/a
RI Resistivity Index two Doppler blood flow
peak velocities RI = (Vmax – V
diastole
)/
Vmax *NOTE*
n/a
*NOTE*:
V
diastole
= V
min
or V
end–diastole
(depends on preset selection)
Table 9–1. OB Calculation Formulas—Tokyo University Factory Defaults