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Pulmonary Physiology & Rehabilitation Section
Interpretive strategies for routine lung function tests
In December 2021, the European Respiratory Journal published the, ERS/ATS technical standard on interpretive strategies for routine lung function tests (Stanojevic S, et al. Eur Respir J. 2021 Dec 23;2101499). Briefly, a few of the updated recommendations are discussed here.
First, the task force recommends the use of Global Lung Initiative (GLI) reference values for spirometry, lung volumes, and diffusing capacity of carbon monoxide. GLI equations were derived from the largest sample of healthy individuals to date and provide an internal consistency across all ages.
Second, it is now recommended that z-scores are used as opposed to percent predicted in grading severity of impairment. Z-scores, which refer to the number of standard deviations a measurement is positioned from the predicted value, centered at zero, account better for age, sex, and height biases compared with percent predicted, and is simplified into mild (z-score -1.65 to -2.5), moderate (-2.51 to -4), and severe (< -4) categories.
A bronchodilator response is now defined as a > 10% change from the predicted value in FEV1 or FVC while the concept of a conditional change score in children and FEV1Q in adults has been introduced to describe lung function change.
The recommendations reflect and reiterate a shift in reporting a range of values, rather than using absolute threshold values, with an emphasis on the classification of physiologic impairments. The uncertainty present as lung function approaches the lower limit of normal is acknowledged, emphasizing the importance of pretest probability in making a clinical diagnosis and/or clinical decision. We encourage all pulmonary clinicians to review this important paper for more detailed information on these changes.
Tom DeCato, MD, Vice-Chair
Gina Lee, MD, Member-at-Large
Pulmonary Physiology & Rehabilitation Section
Interpretive strategies for routine lung function tests
In December 2021, the European Respiratory Journal published the, ERS/ATS technical standard on interpretive strategies for routine lung function tests (Stanojevic S, et al. Eur Respir J. 2021 Dec 23;2101499). Briefly, a few of the updated recommendations are discussed here.
First, the task force recommends the use of Global Lung Initiative (GLI) reference values for spirometry, lung volumes, and diffusing capacity of carbon monoxide. GLI equations were derived from the largest sample of healthy individuals to date and provide an internal consistency across all ages.
Second, it is now recommended that z-scores are used as opposed to percent predicted in grading severity of impairment. Z-scores, which refer to the number of standard deviations a measurement is positioned from the predicted value, centered at zero, account better for age, sex, and height biases compared with percent predicted, and is simplified into mild (z-score -1.65 to -2.5), moderate (-2.51 to -4), and severe (< -4) categories.
A bronchodilator response is now defined as a > 10% change from the predicted value in FEV1 or FVC while the concept of a conditional change score in children and FEV1Q in adults has been introduced to describe lung function change.
The recommendations reflect and reiterate a shift in reporting a range of values, rather than using absolute threshold values, with an emphasis on the classification of physiologic impairments. The uncertainty present as lung function approaches the lower limit of normal is acknowledged, emphasizing the importance of pretest probability in making a clinical diagnosis and/or clinical decision. We encourage all pulmonary clinicians to review this important paper for more detailed information on these changes.
Tom DeCato, MD, Vice-Chair
Gina Lee, MD, Member-at-Large
Pulmonary Physiology & Rehabilitation Section
Interpretive strategies for routine lung function tests
In December 2021, the European Respiratory Journal published the, ERS/ATS technical standard on interpretive strategies for routine lung function tests (Stanojevic S, et al. Eur Respir J. 2021 Dec 23;2101499). Briefly, a few of the updated recommendations are discussed here.
First, the task force recommends the use of Global Lung Initiative (GLI) reference values for spirometry, lung volumes, and diffusing capacity of carbon monoxide. GLI equations were derived from the largest sample of healthy individuals to date and provide an internal consistency across all ages.
Second, it is now recommended that z-scores are used as opposed to percent predicted in grading severity of impairment. Z-scores, which refer to the number of standard deviations a measurement is positioned from the predicted value, centered at zero, account better for age, sex, and height biases compared with percent predicted, and is simplified into mild (z-score -1.65 to -2.5), moderate (-2.51 to -4), and severe (< -4) categories.
A bronchodilator response is now defined as a > 10% change from the predicted value in FEV1 or FVC while the concept of a conditional change score in children and FEV1Q in adults has been introduced to describe lung function change.
The recommendations reflect and reiterate a shift in reporting a range of values, rather than using absolute threshold values, with an emphasis on the classification of physiologic impairments. The uncertainty present as lung function approaches the lower limit of normal is acknowledged, emphasizing the importance of pretest probability in making a clinical diagnosis and/or clinical decision. We encourage all pulmonary clinicians to review this important paper for more detailed information on these changes.
Tom DeCato, MD, Vice-Chair
Gina Lee, MD, Member-at-Large