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A standardized plane for biparietal diameter measurement.

M Shepard1, R A Filly

  • 1Department of Radiology, University of California School of Medicine, San Francisco 94143.

Journal of Ultrasound in Medicine : Official Journal of the American Institute of Ultrasound in Medicine
|May 1, 1982
PubMed
Summary

Standardizing the biparietal diameter measurement plane improves reliability for determining gestational age. However, fetal growth rate variations, not technical errors, remain the primary source of measurement variability.

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Area of Science:

  • Obstetrics and Gynecology
  • Fetal Medicine
  • Medical Imaging

Background:

  • Biparietal diameter (BPD) measurement is crucial for estimating gestational age.
  • A standardized anatomical plane for BPD measurement is currently lacking.
  • This standardization is needed to improve accuracy in fetal assessment.

Purpose of the Study:

  • To establish a standard anatomical plane for biparietal diameter measurement.
  • To assess the impact of a standardized plane on measurement reliability and variability.
  • To differentiate between technical errors and biologic variation in BPD measurements.

Main Methods:

  • 344 biparietal diameter measurements were taken from 256 patients delivering normal infants.
  • Measurements were compared across various cranial levels defined by brain anatomy.

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  • Statistical analysis was performed to evaluate reliability and variability.

    • Main Results:

    • Utilizing a standardized anatomical plane significantly increased the reliability of biparietal diameter measurements.
    • The variability in measurements was not significantly altered by the use of a standardized plane.
    • Results suggest biologic variation in fetal growth rates is the main contributor to measurement variability.

    Conclusions:

    • A standardized plane enhances the dependability of biparietal diameter measurements for gestational age assessment.
    • Biologic variation in fetal growth rates is a more significant factor in measurement variability than technical errors.
    • Further research may focus on understanding and accounting for biologic variations in fetal growth.