GE LOGIQ 7, Basic User Manual

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OB Measurements and Calculations
LOGIQ 7 Basic User Manual 9
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Calculation information
This section of the worksheet provides calculation choices and
lists calculation results.
• EFW – lists the parameters used to calculate EFW. This is
followed by the calculation result.
To change which parameters are used:
a. Select this field or press
Select EFW .
b. Select the desired parameters.
• EFW GP – lists the source used to calculate EFW–GP
(growth percentile). This is followed by the growth
percentile.
To change the source:
a. Select this field or press
Select GP .
b. Select the desired source.
The remaining calculation information shows ratios for several
measurements, and the Cephalic Index (CI).
The worksheet shows if any of the ratios are out of range
(OOR). Out of range indicates one of the following:
• The measurement is out of the normal range based on the
gestational age that is calculated from the LMP. The system
determines OOR from the ultrasound age compared to the
gestational age. The gestational age is calculated from the
last menstrual period or the estimated delivery date.
• The measurement is outside of the range for the data used
in the calculation. That means that the measurement is
either less than or more than the range of measurements
used to determine fetal age based on the measurement.
For more information about how to use the worksheet, See
‘Viewing and Editing Worksheets’ for more information.