FujiFilm SonoSite X-Porte User Manual page 202

Last Menstrual Period Derived (LMPd) by Established Due Date (EDD)
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), p.497-501.
Hansmann, M., et al. Ultrasound Diagnosis in Obstetrics and Gynecology. New York: Springer-Verlag,
(1986), p.431.
University of Tokyo, Shinozuka, N. FJSUM, et al. "Standard Values of Ultrasonographic Fetal Biometry."
Japanese Journal of Medical Ultrasonics, 23:12 (1996), p.885.
WARNING
Biparietal Diameter (BPD)
Chitty, L. S. and D.G. Altman. "New charts for ultrasound dating of pregnancy." Ultrasound in Obstetrics
and Gynecology 10: (1997), p.174-179, Table 3.
Hadlock, F., et al. "Estimating Fetal Age: Computer-Assisted Analysis of Multiple Fetal Growth
Parameters." Radiology, 152: (1984), p.497-501.
Hansmann, M., et al. Ultrasound Diagnosis in Obstetrics and Gynecology. New York: Springer-Verlag,
(1986), p.440.
Osaka University. Ultrasound in Obstetrics and Gynecology. (July 20, 1990), p.98.
University of Tokyo, Shinozuka, N. FJSUM, et al. "Standard Values of Ultrasonographic Fetal Biometry."
Japanese Journal of Medical Ultrasonics, 23:12 (1996), p.885.
Cisterna Magna (CM)
Mahony, B.; P. Callen, R. Filly, and W. Hoddick. "The fetal cisterna magna." Radiology, 153: (December
1984), p.773-776.
6-16
The gestational age calculated by your FUJIFILM 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.
Measurement references