Measurement and Analysis
Vivid S5/Vivid S6 User Manual 323
R2424458-100 Rev. 2
associated with a particular measurement or calculation.
Formulas and databases used within the system software that
are associated with specific investigators are so noted. Be sure
to refer to the original article describing the investigator's
recommended clinical procedures.
Note: When you make measurements, you can select the
calculation before you make the measurement or after you
make it. If you select the calculation before you make the
measurement, the Results Window shows the estimated fetal
age as you make the measurement. If you select the
calculation after you make the measurement, the estimated
fetal age is displayed after you complete the measurement.
The measurements steps in this section tell you to select the
calculation before you make the measurement.
The following pages describe how to make OB measurements
and calculations. The measurements are organized by mode,
and within mode are listed in alphabetical order.
Out of range: If the system indicates that a measurement is
out of range (OOR), it means 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.
Note: Calculation formulas are listed in the Reference Manual.
B-Mode measurements
This section describes all B-Mode measurements that you
typically find in OB studies. Additional OB measurements follow
the typical ones.
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