GE LOGIQ A100, Technical Publication

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OB Report Page
186
LOGIQ
t α
100 User Manual
2211157–100 Rev 0
Tokyo University Report Page (cont’d)
EFBW: Estimated Fetal Body Weight is automatically
computed if BPD, APTD, TTD and FL measurements are
made. If any of the above measurements are not
available, the EFBW field will be blank. EFBW is
calculated using the formula:
EFBW = 1.07xBPD^3+3.42xAPTDxTTDxFL
GA (Pregnancy Origin)
Depending on the parameter chosen for pregnancy origin
the Gestational Age is calculated as described below.
GA (LMP): If LMP is selected in Pregnancy Origin, the
field GA(LMP) appears. The Gestational Age by Last
Menstrual Period is computed from the date of the first
day of the Last Menstrual Period, according to the
formula:
GA (LMP) = {Exam date} – {Last menstrual period}
GA (EDC): If EDC is selected in Pregnancy Origin, the
field GA(EDC) appears. The Gestational Age by
Expected Date of Confinement is computed from the
formula:
GA (EDC) = {EDC} + {Exam date} – {40 weeks or 41
weeks as selected in setup}
GA (BBT): The Gestational Age by Basal Body
Temperature is computed using the formula:
GA (BBT) = {Exam date} – {BBT} + 2 weeks
CGA: The Composite Ultrasound Age is calculated using
the formula
CGA
+
G
1
) G
2
) G
3
) ... ) G
n
n
where G
1
, G
2
, ... G
n
are the Gestational Ages obtained
from the corresponding measurements selected for use
in CGA calculation and n is the total number of such
measurements used.