II. Technique
- Use ellipse
- Transverse abdominal Triad
- Deep portion of Portal Vein (J Sign)
- Spine
- Stomach
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III. Equation
- Abdominal Circumference = (AP + Transverse) x 1.57
IV. Accuracy
- Least accurate of measurements for estimating Gestational age (except 26-32 weeks)
- Most useful beyond 15 weeks for calculating fetal weight, serial growth and diagnosing IUGR
- References
V. Resources
- AJR Online version of Benson and Doubilet article above