What does FEV₁/FVC Ratio (Obstructive vs Restrictive Pattern) do?

FEV₁/FVC Ratio (Obstructive vs Restrictive Pattern) helps you process numeric data content online without setting up a separate local script or app.

When should I use this tool?

Use it when you need a quick process workflow, want to verify output, or need a browser-based utility for health tasks.

Can I try this tool with sample data?

Yes. Try short representative inputs first, then move to larger or more complex cases once the output looks correct.

What inputs does FEV₁/FVC Ratio (Obstructive vs Restrictive Pattern) accept?

FEV₁/FVC Ratio (Obstructive vs Restrictive Pattern) accepts FEV₁ — Forced Expiratory Volume in 1s (L), FVC — Forced Vital Capacity (L), Predicted FVC (L, optional), Decimal Places.

Is there an API for FEV₁/FVC Ratio (Obstructive vs Restrictive Pattern)?

Yes. The tool page includes an API endpoint so you can move from manual testing to scripted usage.

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FEV₁/FVC Ratio (Obstructive vs Restrictive Pattern)

Compute FEV₁/FVC and classify obstructive (<70% GOLD) vs restrictive (normal ratio, reduced FVC) patterns, with the ATS/ERS LLN caveat. Not medical advice.

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2 examples

Obstructive: FEV₁=1.9, FVC=3.8 → ratio 50% (<70%)

FEV₁/FVC = 1.9 / 3.8 = 50%. Below the fixed 70% cutoff this is an obstructive pattern (e.g., COPD or asthma) — grade severity with FEV₁ % predicted and interpret with symptoms.

{"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."}}}

Restrictive pattern: FEV₁=2.0, FVC=2.2, predicted FVC=3.5 → ratio 90.9%, FVC 62.9%

FEV₁/FVC = 2.0 / 2.2 = 90.9% (ratio preserved) but FVC = 2.2/3.5 = 62.9% of predicted — the combination suggests a restrictive pattern, to be confirmed with lung volumes (reduced TLC).

{"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."}}}

Inputs

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4 options

SettingsAdjust formats, ranges, numbers, and modes.4

FEV₁ — Forced Expiratory Volume in 1s (L)numberRequiredForced expiratory volume in 1 second, liters.FVC — Forced Vital Capacity (L)numberRequiredForced vital capacity, liters.Predicted FVC (L, optional)numberOptionalPredicted FVC in liters (e.g., from the vital-capacity-estimator tool); enables %FVC and restrictive-pattern assessment.Decimal PlacesnumberOptional

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FEV₁/FVC Ratio (Obstructive vs Restrictive Pattern)

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