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



(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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