FEV1/FVC Ratio Interpreter

Spirometry Index

Flow-Volume Parameters

Enter values from the PFT report

FEV1 (Liters)Forced Expiratory Vol. (1s)

FVC (Liters)Forced Vital Capacity

Enter Spirometry Data

Provide FEV1 and FVC values to calculate the ratio used for obstructive lung disease screening.

Guidelines & Evidence

Verified

Last Review: 2026

When to Use

Last Comprehensive Review: 2026

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