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Fetal Abdominal Circumference

Technique
1. Transverse abdominal Triad
  1. Deep portion of portal vein (J Sign)
  2. Spine
  3. Stomach
2. Use ellipse
Equation
1. Abdominal Circumference = (AP + Transverse) x 1.57
Accuracy
1. Least accurate of measurements (except 26-32 weeks)

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This page was written by Scott Moses, MD. This page was last revised before 5/10/08, prior to consistent tracking of revision date. This page was last published on 6/1/2008. Please send comments and questions to the editor. Contact information may be found on the page About the Family Practice Notebook. These pages are best viewed with Microsoft Internet Explorer 6.0.