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Related Experiment Videos

Forced expiratory time--its reliability as a lung function test.

J B Macdonald, T J Cole, A Seaton

    Thorax
    |October 1, 1975
    PubMed
    Summary
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    Forced expiratory time (FET) measurements are highly variable, making them unsuitable for screening small airways disease. Despite variability, FET retains clinical value in assessing airway obstruction.

    Area of Science:

    • Pulmonary Medicine
    • Respiratory Physiology

    Background:

    • Forced expiratory time (FET) is a respiratory measurement.
    • Understanding FET variability is crucial for its clinical application.

    Purpose of the Study:

    • To investigate factors influencing the variability of forced expiratory time (FET).
    • To assess the suitability of FET as a screening tool for small airways disease.

    Main Methods:

    • Three studies were conducted to analyze FET variability.
    • Factors examined included observer differences, repeated measurements, time of day, and comparison with other pulmonary function tests over five days.

    Main Results:

    • Observer and time of day did not significantly impact FET variability.

    Related Experiment Videos

  • FET exhibited greater variability over five days compared to peak flow rate, forced expiratory volumes, and mid-expiratory flow rates.
  • FET showed low correlation coefficients with other measures of airway obstruction.

    • Conclusions:

    • FET measurement variability is too high for effective screening of small airways disease.
    • FET remains clinically valuable for assessing airway obstruction despite its limitations as a screening tool.