Gestational Age Tables - FujiFilm SonoSite M-Turbo User Manual

EDD = LMP date + 280 days
Estimated Fetal Weight (EFW)
Hadlock, F., et al. "Estimation of Fetal Weight
with the Use of Head, Body, and Femur
Measurements, A Prospective Study." American
Journal of Obstetrics and Gynecology, 151:3
(February 1, 1985), 333‐337.
Hansmann, M., et al. Ultrasound Diagnosis in
Obstetrics and Gynecology. New York:
Springer‐Verlag, (1986), 154.
Osaka University. Ultrasound in Obstetrics and
Gynecology. (July 20, 1990), 103‐105.
Shepard M.J., V. A. Richards, R. L. Berkowitz, et
al. "An Evaluation of Two Equations for
Predicting Fetal Weight by Ultrasound."
American Journal of Obstetrics and Gynecology, 142:1
(January 1, 1982), 47‐54.
University of Tokyo, Shinozuka, N. FJSUM, et al.
"Standard Values of Ultrasonographic Fetal
Biometry." Japanese Journal of Medical Ultrasonics,
23:12 (1996), 880, Equation 1.
Gestational Age (GA) by Last Menstrual
Period (LMP)
The gestational age derived from the LMP date
entered on the patient information form.
Results are displayed in weeks and days, and is
calculated as follows:
GA(LMP) = System date – LMP date
Gestational Age (GA) by Last Menstrual
Period (LMPd) Derived from Established Due
Date (Estab. DD)
Same as GA by Estab. DD.
The gestational age derived from the system
derived LMP using the Established Due Date
entered on the patient information form.
Results are displayed in weeks and days, and is
calculated as follows:
GA(LMPd) = System Date – LMPd
178 Measurement publications and terminology
Last Menstrual Period Derived (LMPd) by
Established Due Date (Estab. DD)
Results are displayed as month/day/year.
LMPd(Estab. DD) = Estab. DD – 280 days

Gestational age tables

Abdominal Circumference (AC)
Hadlock, F., et al. "Estimating Fetal Age:
Computer‐Assisted Analysis of Multiple Fetal
Growth Parameters." Radiology, 152: (1984),
497‐501.
Hansmann, M., et al. Ultrasound Diagnosis in
Obstetrics and Gynecology. New York:
Springer‐Verlag, (1986), 431.
University of Tokyo, Shinozuka, N. FJSUM, et al.
"Standard Values of Ultrasonographic Fetal
Biometry." Japanese Journal of Medical Ultrasonics,
23:12 (1996), 885.
WARNING: The gestational age calculated by
your SonoSite system does not
match the age in the
aforementioned reference at the
20.0 cm and 30.0 cm abdominal
circumference (AC) measurements.
The implemented algorithm
extrapolates the gestational age
from the slope of the curve of all
table measurements, rather than
decreasing the gestational age for a
larger AC measurement indicated in
the referenced table. This results in
the gestational age always
increasing with an increase in AC.
Biparietal Diameter (BPD)
Chitty, L. S. and D.G. Altman. "New charts for
ultrasound dating of pregnancy." Ultrasound in
Obstetrics and Gynecology 10: (1997), 174‐179,
Table 3.