The abdominal circumference is roughly an ellipse, and the circumference can be estimated if the orthogonal diameters are known
Level of measurement: stomach and umbilical vein-ductus venosus complex
Parameters:
(1) transverse abdominal diameter in cm (TAD)
(2) anteroposterior abdominal diameter in cm (APAD)
abdominal circumference in cm =
= PI() * 0.5 * ((TAD) + (APAD))
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Specialty: Obstetrics & Gynecology
