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Related Experiment Videos

Centile-based ultrasound morphometric tables

M R Lauria1, I E Zador, S F Bottoms

  • 1Wayne State University/Hutzel Hospital, Department of Obstetrics and Gynecology, Detroit, Michigan 48201, USA.

Ultrasound in Obstetrics & Gynecology : the Official Journal of the International Society of Ultrasound in Obstetrics and Gynecology
|May 1, 1995
PubMed
Summary

New ultrasound tables for fetal growth use actual centiles, not just standard deviations. This provides more accurate biparietal diameter, femur length, and abdominal diameter measurements for better pregnancy monitoring.

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Area of Science:

  • Obstetrics and Gynecology
  • Medical Imaging
  • Fetal Development

Background:

  • Current fetal ultrasound growth charts rely on normal distribution assumptions.
  • These estimations may not accurately reflect variations in fetal biometric measurements throughout gestation.

Purpose of the Study:

  • To develop normative ultrasound tables for fetal growth using actual centiles.
  • To provide more precise reference ranges for biparietal diameter, femur length, and average abdominal diameter.

Main Methods:

  • Analysis of ultrasound data from 9510 singleton pregnancies.
  • Calculation of actual 5th, 10th, 50th, 90th, and 95th centiles for key fetal measurements per gestational week.
  • Comparison with centiles estimated using mean and standard deviation.

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Main Results:

  • Gestational age-dependent variation was observed, with increased variability in average abdominal diameter.
  • Differences between actual and estimated centile limits were minimal (≤3 mm).
  • These discrepancies were smaller than intraobserver measurement variability, indicating clinical insignificance.

Conclusions:

  • Actual centile-based ultrasound tables offer a more accurate representation of fetal growth.
  • The developed normative tables are clinically relevant and improve upon existing estimation methods.
  • Accurate fetal biometry monitoring is crucial for optimal pregnancy care.