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Related Experiment Videos

Reference values based on hospital admission laboratory data.

S J Harwood, G W Cole

    JAMA
    |July 21, 1978
    PubMed
    Summary
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    Laboratory test results are best understood using percentile rankings, not traditional normal ranges. This method enhances the correlation between test deviations and clinical problems for better patient diagnosis.

    Area of Science:

    • Clinical Pathology
    • Medical Laboratory Science

    Background:

    • Traditional interpretation of laboratory test results relies on fixed normal ranges.
    • This approach may oversimplify or miss clinically significant deviations.

    Purpose of the Study:

    • To evaluate the utility of a percentile ranking system for laboratory test interpretation.
    • To compare the percentile system with classic normal ranges for diagnostic correlation.

    Main Methods:

    • Analysis of laboratory values from over 13,000 newly admitted patients.
    • Preparation of histograms for 24 common laboratory tests using percentile rankings.

    Main Results:

    • Percentile ranking provides a more nuanced interpretation than standard normal ranges.

    Related Experiment Videos

  • Greater deviations from the midrange showed stronger correlation with clinical problems.
  • Minor deviations were often unexplained, regardless of interpretation method.

    • Conclusions:

    • A percentile ranking system offers superior interpretation of laboratory test results.
    • This method improves the ability to correlate test abnormalities with patient conditions.
    • Moving beyond simple high/low/normal categorizations preserves diagnostic value.