The simple idea
- FVC (forced vital capacity) — total air blown out with maximal effort.
- FEV₁ — air blown out in the first second. Healthy people blow out about 75–80% of their FVC in the first second.
- FEV₁/FVC ratio — the key number.
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Part 6 · The Lungs and Breathing
Same concept, other depth: Clinical Reasoning →
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