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Abdominal Circumference (AC)

Data sources

  • INTERGROWTH-21st:
  • Centiles (3rd-97th):contentReference[oaicite:1]{index=1}.
  • Z-scores (-3 to +3 SD):contentReference[oaicite:2]{index=2}.
  • NICHD: Population-stratified percentiles for AC.

Mapping strategy

  • AC is especially important for diagnosing fetal growth restriction (FGR).
  • Values <10th percentile are considered abnormal, particularly when combined with low estimated fetal weight.

Planned extensions

  • Harmonize AC interpretation across standards.
  • Integrate with estimated fetal weight formulas (Hadlock, INTERGROWTH).