82 Chapter 4: Measurements and Calculations
Meas. & Calcs
The following terms describe the measurements and calculations performed by the system.
References for measurements and calculations are in Chapter 8, “References.”
Table 8: OB Calculation Terms
Acronym Definition
AUA The AUA (Average Ultrasound Age) is calculated by averaging the
individual ultrasound ages for the fetal biometry measurements
performed during the exam. The measurements used to determine the
AUA are based on the selected OB calculation authors.
EDD by AUA The EDD by AUA (Estimated Date of Delivery by Average Ultrasound Age)
is the estimated date of delivery calculated from the measurements
performed during the exam.
EDD by LMP The EDD by LMP (Estimated Date of Delivery by Last Menstrual Period) is
the due date calculated from the user entered LMP.
EFW The EFW (Estimated Fetal Weight) is calculated from the measurements
performed during the exam. The measurements used to determine EFW
are defined by the currently selected EFW calculation author.
Estab. DD The Estab. DD (Established Due Date) is a user entered due date based on
previous exam data or other available information. The LMP is derived
from the Established Due Date and is listed in the patient report as LMPd.
GA by LMP The GA (Gestational Age by Last Menstrual Period) is the fetal age
calculated using the date of the Last Menstrual Period (LMP).
GA by LMPd The GA (Gestational Age by derived Last Menstrual Period) is the fetal age
calculated using the Last Menstrual Period (LMPd) derived from the
Established Due Date.
LMP The LMP (Last Menstrual Period) is the first day of the Last Menstrual
Period and is used to calculate gestational age and EDD.
LMPd The LMPd (derived Last Menstrual Period) is calculated from the user
entered Established Due Date (Estab. DD).
UA The UA (Ultrasound Age) is calculated on the mean measurements taken
for a particular fetal biometry.
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