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Operation Manual
Calculating Estimated Fetal Weight (EFW)
When measurements for the following items are complete, the system uses the results to calculate
the estimated fetal weight automatically. For an equation for calculating fetal weight, please refer to
“Estimated Fetal Weight Formula” in the Reference Manual Part 1.
X
BPD and AC
X
BPD, FL and FTA
X
BPD, APTD, TTD and FL
X
BPD, APTD, TTD and SL
X
BPD and TTD
X
AC and FL
X
BPD, AC and FL
X
HC, AC and FL
X
BPD,HC, AC and FL
X
AC
Continuous Measurement / Review for EFW Calculation
You can measure OB item(s) continuously for EFW calculation.
Tips!
Before starting measurement:
1. Make sure that the User Key has been set for EFW continuous measurements. You can set EFW
continuous measurements by User Key from Utility > Setup > User Dened key > User Key
Setup > User Key. For more information, see ‘Peripheral Device Settings’ in Chapter 3 “Setup”.
2. Check EFW Reference. You can select or change it from Utility > Measure Setup > OB > Tables
> Fetal weight > EFW Equation. Alternatively, you may use the EFW dial-button [5] in the OB
measurement menu to change the EFW Reference.
NOTE: This function is not available in 3D mode. .
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How to measure
1. Press the User Key1 (or User Key 2) on the control panel. OB menu and measure items are
displayed on the screen.
2. Measure the items for EFW calculation using trackball and the Set button.
3. Press the Freeze button to nish the rst measurement.
4. Press the Freeze button to measure the next items.
5. When you nish the measurement for all items, the result will be displayed on the monitor.
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