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Related Experiment Video

Updated: Feb 14, 2026

Continuous Telemetric In Utero Tracheal Pressure Measurements in Fetal Lambs
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Inter-observer variability in fetal biometric measurements.

Rami Kilani1, Wesam Aleyadeh1, Luay Abu Atieleh2

  • 1Hashemite University, Zarqa, Jordan.

Taiwanese Journal of Obstetrics & Gynecology
|February 21, 2018
PubMed
Summary
This summary is machine-generated.

Fetal biometric measurements using ultrasound are reproducible between different observers. Measurements of head circumference, abdominal circumference, and femur length showed high consistency, ensuring reliable clinical data.

Keywords:
Abdominal circumference (AC)Bland–Altman plotsFemur length (FL)Head circumference (HC)Interclass correlation coefficient (ICC)

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Area of Science:

  • Obstetrics and Gynecology
  • Medical Imaging
  • Fetal Medicine

Background:

  • Accurate fetal biometry is crucial for monitoring pregnancy progression and detecting potential abnormalities.
  • Inter-observer variability in ultrasound measurements can impact clinical decision-making and patient outcomes.

Purpose of the Study:

  • To assess the reproducibility of fetal biometric measurements (head circumference, abdominal circumference, femur length) between different sonographers.
  • To quantify inter-observer variability using statistical methods like correlation coefficients and Bland-Altman plots.

Main Methods:

  • A prospective cohort study involving 192 pregnant women (18-36 weeks gestation).
  • Two transabdominal ultrasound scans were performed by different observers for key fetal biometric parameters.
  • Inter-class correlation coefficients (ICC) and Bland-Altman plots were utilized to analyze measurement agreement.

Main Results:

  • High inter-observer agreement was observed for abdominal circumference (ICC 0.996) and femur length (ICC 0.990).
  • Bland-Altman analysis indicated substantial agreement for all measured parameters, with abdominal circumference showing the highest agreement, followed by head circumference.
  • Paired t-tests confirmed no statistically significant difference between duplicate measurements (P > 0.05).

Conclusions:

  • Ultrasound measurements of fetal head circumference, abdominal circumference, and femur length demonstrate high reproducibility among different operators in a clinical setting.
  • These findings support the reliability of fetal biometry for routine obstetric care.
  • Further large-scale studies are recommended to reinforce these findings and address the clinical implications of precise fetal measurements.