A&T Respiratory offers comprehensive courses, webinars, conference and resources for mastering respiratory care.
Input FEV₁%, FVC%, and FEV₁/FVC ratio to instantly identify obstructive, restrictive, or mixed pulmonary function patterns.
Enter values below and click the button to get your result.
For educational reference only. Always verify results with your clinical team and follow your facility's protocols.
Enter FEV₁ as a percentage of predicted (e.g., 78)
Enter FVC as a percentage of predicted (e.g., 85)
Enter the FEV₁/FVC ratio as a percentage (e.g., 68)
Click 'Interpret Spirometry' for the pattern and severity
Normal: FEV₁/FVC ≥ 70%, FEV₁ ≥ 80%, FVC ≥ 80%
Obstructive: FEV₁/FVC < 70% — COPD, asthma, bronchiectasis
Restrictive: FEV₁/FVC normal, FVC < 80% — ILD, fibrosis, obesity
Mixed: FEV₁/FVC < 70% AND FVC < 80% — consider TLC measurement
Severity based on FEV₁: ≥ 70% mild, 60–69% moderate, 50–59% moderately severe, 35–49% severe, < 35% very severe
Sharpen your clinical skills and earn Continuing Education Units (CEUs) through our expert-led respiratory therapy lectures — available online and at destination conferences.
Use our free CEU Tracker to manage your continuing education and never miss a renewal deadline.