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Medicine

Spirometry Interpretation Strategies in Restrictive Lung Patterns

Quick fact

In restrictive lung disease, the FEV1/FVC ratio is often normal or even increased (e.g., 80%), because both FEV1 and FVC are reduced proportionally—a key clue that differentiates it from obstruction, where the ratio is decreased.

Why this is interesting

You've just watched a patient blow into a spirometer, and the numbers look 'low.' But is it a lung that can't empty, or a lung that can't fill? The answer isn't in the numbers alone—it's in the ratio.