Chapter 4: Measurements and Calculations 83
Meas. & Calcs
If you change the calculation author during the exam, the common measurements are retained.
The following table shows the system defined measurements available for OB calculations by
author. For descriptions of the acronyms, see “Acronyms” on page 211.
Table 9: System Defined OB Calculations and Table Authors
Calculation Result
Gestational OB
Measurements
Table Authors
Gestational Age
(See note 1)
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.*
APTD Tokyo U.*
AC Hadlock
Hansmann
Tokyo U.
FTA Osaka
FL Chitty
Hadlock
Hansmann
Osaka
Tokyo U.
* For Toyko U, APTD and TTD are only used to calculate EFW. No age or growth tables are
associated with these measurements.
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