Routine Lung Function Tests

Publication Date: December 22, 2021

Key Points

Key Points

  • Interpretation of pulmonary function tests (PFTs) must take into account a level of uncertainty relating to:
    1. how representative the obtained result was of the individual’s lung function at the time of testing,
    2. how the pre-test probability of disease may influence what is the appropriate threshold for that individual, and
    3. how valid for the individual the reference population is against which the test is being judged.
  • In the future it may also be reasonable to set clinical decision-making thresholds for a test based on clinical risk and observed clinical outcomes.
  • A more comprehensive approach to interpretation (not simply relying on whether results are within or outside the normal range) is imperative for appropriate interpretation of lung function when pre-screening for employment, for tracking the effects of exposure, for disability assessment, and for risk assessment for therapies potentially toxic to the lungs.
  • The interpretation of PFT results must always consider the inherent biological variability of the tests and the uncertainty of the test result.

Interpretation

...terpretati...

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Figures

...igure...

...Distribution With Z-scores and Percentiles Disp...


...re 2. FEV1/FVC Predicted and Limit...


...ison of the ATS/ERS 2005 Recommendations to AT...


...gure 4. Examples of Typical Flow-Vol...


...oach to Interpretation of Spirometry...


...ification of Ventilatory Impairments Def...


...igure 6. Approach to Interpretation of DLCO...


...Approach to Interpretation of Lung...


...assification of Ventilatory Impairments Def...


Tables

Table...

...ble 1. Functional Classification of C...


Table 2. Summary of Types of Spirometr...


...3. Lung Function Indices Capable of Dif...