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Related Experiment Videos

Abdominal circumference vs abdominal area--which is better?

J S Woo, S T Liang, C W Wan

    Journal of Ultrasound in Medicine : Official Journal of the American Institute of Ultrasound in Medicine
    |March 1, 1984
    PubMed
    Summary

    Ultrasonic abdominal circumference (AC) measurements are more effective than abdominal area (AA) measurements for assessing fetal growth. AC provides better correlation with fetal weight and detection rates for small-for-date fetuses.

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    Area of Science:

    • Obstetrics and Gynecology
    • Fetal Medicine
    • Diagnostic Ultrasound

    Background:

    • Accurate assessment of intrauterine fetal growth is crucial for optimal pregnancy management.
    • Various ultrasound parameters are used, but their comparative efficacy requires ongoing evaluation.
    • Abdominal circumference (AC) and abdominal area (AA) are common fetal biometry measurements.

    Purpose of the Study:

    • To compare the diagnostic efficacy of ultrasonic abdominal circumference (AC) and abdominal area (AA) measurements for evaluating intrauterine fetal growth.
    • To determine which measurement offers better correlation with estimated fetal weight and detection rates for small-for-date fetuses.

    Main Methods:

    • A comparative study evaluating ultrasonic measurements of fetal AC and AA.

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  • Analysis of intraobserver errors and technical variability for both AC and AA measurements.
  • Correlation analysis of AC and AA with intrauterine fetal weight using linear and multiple regression models.
  • Assessment of detection rates for small-for-date fetuses between 32 and 38 weeks gestation.

    • Main Results:

    • Intraobserver random and technical errors were significantly higher for abdominal area (AA) measurements compared to abdominal circumference (AC).
    • Abdominal circumference (AC) demonstrated a better correlation with estimated intrauterine fetal weight than abdominal area (AA).
    • A single AC measurement detected 74% of small-for-date fetuses, whereas a single AA measurement detected only 58% between 32 and 38 weeks.

    Conclusions:

    • Abdominal area (AA) measurements offer no additional benefit over abdominal circumference (AC) measurements in the routine assessment of intrauterine fetal growth.
    • Abdominal circumference (AC) is a more reliable parameter for evaluating fetal growth and identifying growth-restricted fetuses.
    • Routine use of AA measurements in fetal growth assessment is not recommended due to higher error rates and lower detection efficacy.