Chapter 7 - Working With Measurements
Measuring in the 2D Window
Terason t3000 / Echo Ultrasound System User Guide
163
Estimated Fetal Weight Calculation
Calculating Gestational Sac Size and Age
For a first trimester obstetrical exam, the Terason software can calculate the mean
gestational sac size (GSS), and based on that size, provide the estimated gestational age
(GA). Terason uses the Hadlock formula and tables (see Appendix D -
). To use a measurement setup other than Hadlock, see
on page 250. If you choose a different setup, the selected setup may not support
the GSS and GA calculation.
To measure the mean gestational sac size, complete the following steps:
1.
Perform an obstetrical
exam
.
2.
Click .
3.
Select
GSDH
from the Measurement menu and measure the gestational sac diameter
height.
4.
If necessary, click
and acquire a view for the gestational sac diameter width
measurement, then click the Freeze button
.
5.
Select
GSDW
from the Measurement menu and measure the gestational sac diameter
width.
6.
If necessary, click
Live
and acquire a view for the gestational sac diameter length
measurement, then click
Freeze
.
7.
Select
GSDL
from the Measurement menu and measure the gestational sac diameter
length.
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