Chapter 8: References 197
References
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
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.
Anteroposterior Trunk Diameter (APTD)
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.
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