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.
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)
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