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Variation in Fetal Weight Percentile Estimates.

Garvit D Khatri1, Michael L Richardson1, Manjiri Dighe1

  • 1University of Washington, Seattle, Washington, USA.

Journal of Ultrasound in Medicine : Official Journal of the American Institute of Ultrasound in Medicine
|February 14, 2022
PubMed
Summary
This summary is machine-generated.

Estimated fetal weight percentiles are imprecise predictors of actual fetal growth. Reporting expected variations can prevent misdiagnosis of fetal growth restriction (IUGR) and macrosomia, reducing unnecessary interventions.

Keywords:
IUGRerrors outcome measurementsfetal growthfetal weightultrasound

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Area of Science:

  • Obstetrics and Gynecology
  • Fetal Medicine
  • Medical Imaging

Background:

  • Fetal weight percentiles are commonly used in clinical practice.
  • Current reporting methods often lack error margins, potentially leading to misclassification.

Purpose of the Study:

  • To compare estimated fetal weight percentiles with actual observed percentiles.
  • To assess the accuracy of estimated fetal weight percentiles in a large cohort.

Main Methods:

  • Retrospective search of obstetrical ultrasound reports (July 2014 - July 2020).
  • Data extraction included demographic information, fetal weight, and weight percentiles.
  • Quantile-quantile plots were generated for analysis.

Main Results:

  • The study analyzed 6259 ultrasounds from 4060 patients.
  • While median values approximated the line of identity, considerable variation was observed.
  • Estimated fetal weight percentiles were found to be rough predictors of actual percentiles.

Conclusions:

  • Estimated fetal weight percentiles demonstrate significant variability and are imprecise.
  • Reporting estimated variations alongside percentiles is recommended.
  • Accurate percentile reporting can prevent misdiagnosis of fetal growth abnormalities and reduce clinical complications.