User guide

66 Exam-based calculations
Results from System-Defined OB
Measurements and Table Authors
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
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
Growth
Analysis
Tables
d
BPD Chitty,
Hadlock,
Jeanty
HC Chitty,
Hadlock,
Jeanty
AC Chitty,
Hadlock,
Jeanty
FL Chitty,
Hadlock,
Jeanty
EFW Brenner,
Hadlock,
Jeanty
HC/AC Campbell
Calculation
Result
Gestational OB
Measurements
Table
Authors