Table 1 Diagnostic criteria for specific types of obstructive lung disease (OLD).
From: A population-based cohort study on the risk of obstructive lung disease after bilateral oophorectomy
OLD type and sub-type | Criteria |
|---|---|
Asthma | |
Confirmed | GINA 2019 definition - obstructive baseline spirometry (FEV1/FVC ratio <70%) from PFT with increase from baseline FEV1 post-bronchodilation (>0.2 L and >12%), and/or decrease in baseline FEV1 post-provocation (≥20% after methacholine or ≥15% after other types) |
Probable | One or more diagnostic codes for asthma, and PFT without provocation study |
Possible | One or more diagnostic codes for asthma without any PFT |
COPD | |
Confirmed | GOLD 2019 definition - obstructive spirometry post-bronchodilation (FEV1/FVC ratio <70%) from PFT |
Probable | Non-specific pattern from PFT, with high airway resistance or high total lung capacity |
Emphysema without airflow limitation | Findings of emphysema on chest CT, with non-obstructive findings from PFT |
Emphysema without PFT | Findings of emphysema on chest CT without any PFT |
Undifferentiated OLD | Obstructive baseline spirometry (FEV1/FVC ratio <70%) from PFT without variability evaluation |
Chronic bronchitis | Two or more diagnostic codes for bronchitis separated by >90 days to ensure chronic state, but <1 year apart to avoid false positives |
Other OLD | Non-specific pattern from PFT, without testing for small airway resistance or total lung capacity |
