Fetal AC> 90%: Diagnosis?

Fetal AC> 90%: Diagnosis?

From Dr. Chapa's OBGYN No Spin Podcast by Hector Chapa

April 11, 2026 · 15 min

About this episode

This episode discusses the diagnostic implications of an isolated fetal abdominal circumference greater than 90% in relation to macrosomia.

The diagnosis of fetal growth restriction can be made with an isolated abdominal circumference less than the 10th percentile. So is the opposite true? Does a fetal abdominal circumference (isolated) of greater than 90% qualify for “LGA” fetus? In this episode we're going to explain why, although it is logically correct, it is diagnostically incorrect. An isolated abdominal circumference on ultrasound of greater than 90% is however a strong predictive risk factor for one delivery finding. Listen in for details. 1. Macrosomia: ACOG Practice Bulletin, Number 216. Obstetrics and Gynecology. 2020 2. Canavan TP, Hill LM.. Sonographic Biometry in the Early Third Trimester: A Comparison of Parameters to Predict Macrosomia at Birth. Journal of Clinical Ultrasound : JCU. 2015. 3. Culliney KA, Parry GK, Brown J, Crowther CA. Regimens of Fetal Surveillance of Suspected Large-for-Gestational-Age Fetuses for Improving Health Outcomes.The Cochrane Database of Systematic Reviews. 2016.

People in this episode

Host: Hector Chapa

Topics covered

  • fetal growth restriction
  • abdominal circumference
  • LGA fetus
  • diagnostic criteria
  • ultrasound findings

Keywords

  • fetal growth restriction
  • abdominal circumference
  • LGA
  • diagnosis
  • ultrasound
  • macrosomia

Mentioned in this episode

Organizations: ACOG

Books & works: Obstetrics and Gynecology, Journal of Clinical Ultrasound : JCU, The Cochrane Database of Systematic Reviews

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