50 Calculations
a. The Gestational Age is automatically calculated and displayed
next to the OB measurement you selected. The average of the
results is the AUA.
b. For Tokyo U., APTD and TTD are used only to calculate EFW. No
age or growth tables are associated with these
measurements.
c. The Estimated Fetal Weight calculation uses an equation that
consists of one or more fetal biometry measurements. The
author for the OB tables, which you choose on a system setup
page, determines the measurements you must perform to
obtain an EFW calculation. (See “OB Calculations setup” on
page 16.)
Individual selections for Hadlock’s EFW equations 1, 2, and 3
are not determined by the user. The selected equation is
determined by the measurements that have been saved to
the report with priority given to the order listed above.
To measure gestational growth (2D)
Foreach2DOBmeasurement(exceptAFI,
CxLen,andYS),thesystemsavesuptothree
individualmeasurementsandtheiraverage.If
youtakemorethanthreemeasurements,the
earliestmeasurementisdeleted.
1 Inthepatientinformationform,selectOB
examtype,andselectLMPorEstab.DD.
2 Onafrozen
2Dimage,press Calcs.
3 Dothefollowingforeachmeasurementyou
wanttotake:
Calculation
Result
Gestational OB
Measurements
Table
Authors
Gestational
Age
a
YS —
GS Hansmann,
Nyberg, Tokyo U.
CRL Hadlock,
Hansmann,
Osaka, Tokyo U.
BPD Chitty, Hadlock,
Hansmann,
Osaka, Tokyo U.
OFD Hansmann
HC Chitty, Hadlock,
Hansmann
TTD Hansmann,
Tokyo U.
b
APTD
Tokyo U.
b
AC Hadlock,
Hansmann,
Tokyo U.
FTA Osaka
FL Chitty, Hadlock,
Hansmann,
Osaka, Tokyo U.
HL Jeanty
Tibia Jeanty
TCD —
CM —
Lat V —
CxLen —
Estimated Fetal
Weight (EFW)
c
HC, AC, FL Hadlock 1
BPD, AC, FL Hadlock 2
AC, FL Hadlock 3
BPD, TTD Hansmann
BPD, FTA, FL Osaka U.
BPD, AC Shepard
BPD, TTD, APTD, FL Tokyo U.
Ratios HC/AC Campbell
FL/AC Hadlock
FL/BPD Hohler
FL/HC Hadlock
Amniotic Fluid
Index
Q
1
, Q
2
, Q
3
, Q
4
Jeng
Calculation
Result
Gestational OB
Measurements
Table
Authors
To Next Page
Loading...
