Obstetrics Book

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Fetal Abdominal Circumference

Aka: Fetal Abdominal Circumference
  1. Technique
    1. Use ellipse
    2. Transverse abdominal Triad
      1. Deep portion of Portal Vein (J Sign)
      2. Spine
      3. Stomach
    3. ObUltrasoundAbdominalCircumference.jpg
    4. ObUltrasoundAbdominalcircumference.gif
  2. Equation
    1. Abdominal Circumference = (AP + Transverse) x 1.57
  3. Accuracy
    1. Least accurate of measurements for estimating Gestational age (except 26-32 weeks)
    2. Most useful beyond 15 weeks for calculating fetal weight, serial growth and diagnosing IUGR
    3. References
      1. Benson (1991) AJR Am J Roentgenol 157(6):1275-7 [PubMed]
  4. Resources
    1. AJR Online version of Benson and Doubilet article above
      1. http://www.ajronline.org/doi/pdf/10.2214/ajr.157.6.1950881

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