Measurement and Analysis
330 Vivid S5/Vivid S6 User Manual
R2424458-100 Rev. 2
Estimated Fetal Weight (EFW)
To measure estimated fetal weight, you make several OB
measurements. These measurements can vary, based on how
your system is set up. Measurements can include biparietal
diameter, fetal trunk area, femur length, antero-postero trunk
diameter and transverse trunk diameter, abdominal
circumference, head circumference and spinal length.
• Activate the Worksheet.
The calculation for EFW will appear under 2D
Calculations label as soon as the required measurements
have been made.
Note: For a description of any of the required measurements,
refer to that measurement.
M-Mode measurements
There are no special tools for OB other than the general
M-Mode measurement tools found under all applications.
Doppler Mode Measurements
You can use Doppler mode to study fetal blood flow in the
heart, umbilical cord, placenta, and middle cerebral arteries.
OB/GYN Doppler mode also allows you to study uterine and
ovarian blood flow.
The OB/GYN vessel study includes the following vessels:
• Aorta
• Desc. Aorta
• Middle Cerebral Artery (MCA) (right and left)
• Ovarian (right and left)
• Placenta
• Umbilical
• Uterine (right and left)
For each of these studies, you can make any of the following
measurements:
• Peak Systole (PS)
• End Diastole (ED)
• Minimum Diastole (MD)
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