Stage 1 emphysema is diagnosed when FEV1 is at least 80% of the average for a person's age, sex, and height after bronchodilator use.
Notes on verification
Confirmed by multiple peer-reviewed sources and clinical trial protocols citing GOLD staging criteria; claim omits the required FEV1/FVC <0.70 ratio but the core FEV1 threshold detail is accurate.
Sources
- Stage 1 (Mild) Emphysema - COPD (webmd.com)
- https://pmc.ncbi.nlm.nih.gov/articles/PMC3384372/table/A01tab01 (pmc.ncbi.nlm.nih.gov)
- https://pmc.ncbi.nlm.nih.gov/articles/PMC5791247/table/Tab2 (pmc.ncbi.nlm.nih.gov)
- https://clinicaltrials.gov/study/NCT02346604 (clinicaltrials.gov)