OB Measurements and Formulas
LOGIQ 500 Basic Users Manual
2276612–100 Rev. 0
9–20
Amniotic Fluid Index (AFI)
The Amniotic Fluid Index is determined by taking distance
measurements of the 4 quadrants of the uterine cavity. These 4
measurements are added together to calculate the Amniotic
Fluid Index.
Press the Measurement key once to display a “
” cursor on
the screen, and to display distance in cm on the bottom part of
screen. Select AFI from the OB Measurement Soft Menu. The
distance measurement changes to AFI1 (2, 3 or 4).
Perform a standard distance measurement as described in
7–7
.
When the measurement of the first quadrant is completed,
unfreeze and move to the second quandrant. After the image is
obtained, press Freeze and then Measurement. The user is
then prompted to continue with the AFI measurements.
Perform a standard distance measurement for the second
quadrant.
Repeat these steps for quandrants 3 and 4.
When all 4 quadrants have been measured, the AFI will be
calculated and displayed in the Calculation Result Area of the
display.
The skip function using the Ellipse rocker switch is not available
for AFI.
Unfreezing the image after doing an AFI measurement does not
delete the previous measurements. Unfreeze and change scan
planes as necessary. Make the remaining measurements to
arrive at the AFI value by following the basic distance
measurement procedure.
If any generic distance measurements are unassigned before
invoking the Amniotic Fluid Index these measurements will be
used. Only the remaining distance measurements need to be
made to arrive at an AFI.
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