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Ultrasound anthropometric reliability

T W Harstad1, P H Buschang, B B Little

  • 1Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas 75235-9032.

Journal of Clinical Ultrasound : JCU
|November 1, 1994
PubMed
Summary
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Sonographic measurement errors in pregnancy were assessed. Results show significant error components affecting reliability, necessitating careful interpretation of ultrasound data.

Area of Science:

  • Obstetrics and Gynecology
  • Medical Imaging
  • Biostatistics

Background:

  • Accurate fetal biometry is crucial for pregnancy monitoring.
  • Sonographic measurements are widely used but subject to error.
  • Understanding method error and reliability is essential for clinical interpretation.

Purpose of the Study:

  • To estimate method errors and reliabilities for key sonographic measurements.
  • To identify factors influencing measurement accuracy in obstetric ultrasound.

Main Methods:

  • Seven sonographic measurements were replicated by two experienced sonographers in 106 pregnancies.
  • Multilevel modeling was employed to estimate variance components and identify covariates.
  • Intraobserver and interobserver reliability were calculated.

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Main Results:

  • Intraobserver reliability varied from 85.2% (abdominal circumference) to 99.3% (femur diaphysis length).
  • Interobserver reliability ranged from 80.8% (transabdominal distance) to 92.4% (femur diaphysis length).
  • Method errors ranged from 0.8 mm to 7.8 mm, influenced by parity, estimated menstrual age, and maternal abdominal wall thickness.

Conclusions:

  • Significant error components impact the reliability of obstetric sonographic measurements.
  • Clinicians must consider these errors when interpreting ultrasound-derived fetal parameters.
  • Further research into error reduction strategies is warranted.