learn.howToCalculate
learn.whatIsHeading
FEV1 (Forced Expiratory Volume in 1 second) is the volume of air expelled in the first second of a forced breath out. FEV1/FVC ratio (Tiffeneau index) < 0.70 is diagnostic of obstructive lung disease. FEV1 < 80% predicted indicates airflow limitation.
단계별 가이드
- 1FEV1/FVC < 0.70 → obstruction (COPD, asthma)
- 2FEV1 ≥ 80% predicted = normal
- 3FEV1 70–79% = mild obstruction
- 4FEV1 50–69% = moderate · FEV1 < 50% = severe
풀어진 예시
입력
FEV1=2.5L · FVC=3.2L · predicted FEV1=3.5L
결과
FEV1/FVC=0.78 → obstruction · 71% of predicted → moderate
Both ratio and % predicted needed for staging
계산할 준비가 되셨나요? 무료 FEV1 Spirometry 계산기를 사용해 보세요
직접 시도해 보세요 →