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Related Experiment Videos

Selection of the best spirometric values for interpretation

J B Sorensen, A H Morris, R O Crapo

    The American Review of Respiratory Disease
    |November 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

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    Selecting the best spirometric test values for reporting is crucial. Using the "best test" method, which selects values from a single tracing, is accurate and simpler than the maximal method for FVC and FEV1 interpretation.

    Area of Science:

    • Pulmonary Function Testing
    • Respiratory Medicine
    • Clinical Diagnostics

    Background:

    • Spirometry is essential for diagnosing and monitoring respiratory diseases.
    • Standardization of spirometric test value selection is debated.
    • Previous recommendations include using maximal values (ATS) or best test values (ITS).

    Purpose of the Study:

    • To compare the accuracy and practicality of two spirometric test selection methods: maximal values versus the best test.
    • To evaluate the clinical implications of selecting FVC and FEV1 from different tracings versus a single tracing.

    Main Methods:

    • Analysis of 1,853 spirometric test sessions from 1,101 subjects (hospital patients and normal volunteers).
    • Comparison of forced vital capacity (FVC) and forced expiratory volume in 1 second (FEV1) values selected by the maximal method versus the best test method.

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  • Assessment of differences against the American Thoracic Society (ATS) minimal instrument accuracy standard.

    • Main Results:

    • Mean differences between maximal and best test FVC and FEV1 were small (5.8 ml and 8.4 ml, respectively).
    • Differences were within the ATS accuracy standard in over 95% of comparisons for both FVC and FEV1.
    • The best test method yielded results comparable in accuracy to the maximal method.

    Conclusions:

    • The best test method for selecting spirometric values (FVC and FEV1) is accurate and does not compromise clinical interpretation.
    • The best test method offers a simpler and more practical approach for reporting spirometric results.
    • This finding supports the adoption of the best test method for routine clinical use.