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FEV1/FVC Interpreter
All health tools
Interpret spirometry results to assess lung function.
Pulmonary Function Data
Ratio
Fev1
%
Fvc
%
Result Title
Primary Pattern
Normal
Severity / Grade
No impairment
Quick Chart
Ratio < 0.7
Obstructive
Predict FVC < 80%
Restrictive
Both Normal
Normal Lung Function
About this calculator
Overview
The FEV1/FVC ratio is used to diagnose obstructive and restrictive lung diseases.
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Pro Tips
A ratio below 0.70 suggests obstructive lung disease.
Normal ratio is typically above 0.70.
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Fun Facts
"FEV1 is the volume of air exhaled in the first second."
"FVC is the total volume of air exhaled forcefully."
