FEV1/FVC Ratio >0.70 — FRCA Primary MCQ
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Correct answer: A — >0.70
The normal FEV1/FVC ratio is >0.70 (70%). In obstructive airways disease (COPD / asthma) the ratio is reduced (<0.70) due to decreased FEV1 with relatively preserved FVC. In restrictive disease both FEV1 and FVC are reduced proportionally so the ratio is preserved or increased (>0.70). This ratio distinguishes obstructive from restrictive patterns on spirometry.
Reference: Power Kam 2018 Principles of Physiology for the Anaesthetist