阻塞性:FEV₁=1.9,FVC=3.8 → 比值 50%(<70%) FEV₁/FVC = 1.9/3.8 = 50%。低于固定 70% 阈值,为阻塞性通气障碍(如 COPD 或哮喘)——严重度需结合 FEV₁ 占预计值百分比与症状判读。{"result":"FEV₁/FVC = 1.9 / 3.8 = 50.0% — Obstructive pattern (GOLD fixed ratio <70%).","metadata":{"input":{"fev1":1.9,"fvc":3.8},"result":{"fev1":1.9,"fvc":3.8,"ratioPct":50,"pctFvc":null,"category":"Obstructive pattern — FEV₁/FVC < 70% (GOLD fixed ratio)","method":"FEV₁/FVC = FEV₁ ÷ FVC × 100%","model":"GOLD 2024; ATS/ERS 2019; StatPearls. Not medical advice."}}}
限制性表现:FEV₁=2.0,FVC=2.2,预计 FVC=3.5 → 比值 90.9%,FVC 占 62.9% FEV₁/FVC = 2.0/2.2 = 90.9%(比值保留)但 FVC = 2.2/3.5 = 62.9% 预计值——该组合提示限制性通气障碍,需肺总量(TLC 降低)确认。{"result":"FEV₁/FVC = 2 / 2.2 = 90.9% — normal ratio; FVC 62.9% of predicted suggests restriction.","metadata":{"input":{"fev1":2,"fvc":2.2,"predictedFvc":3.5},"result":{"fev1":2,"fvc":2.2,"predictedFvc":3.5,"ratioPct":90.9,"pctFvc":62.9,"category":"Normal ratio with reduced FVC — pattern suggests restriction","method":"FEV₁/FVC = FEV₁ ÷ FVC × 100%","model":"GOLD 2024; ATS/ERS 2019; StatPearls. Not medical advice."}}}