Abdominal Circumference

 

Landmarks

 

 

Measurement


Circumference = D1 + D2 x 1.57

Abdominal Circumference (Tables / Graphs)

Variability

12-18 wks
18-24 wks
24-30 wks
30-36 wks
36-42 wks

+/- 1.9 wks
+/- 2.0 wks
+/- 2.2 wks
+/- 3.0 wks
+/- 2.5 wks

Precision of predictors of Gestational Age

Head circumference / Abdominal circumference ratio – Campbell et.al. 1977

Head circumference / Abdominal circumference ratio – Campbell et.al. 1977