Diagnosis of airways obstruction should be based on symptoms and an FEV1/FVC ratio below the lower limit of normal

In their article on the diagnosis of chronic obstructive pulmonary disease (COPD) in primary care, Conway and colleagues state that the diagnosis can be confirmed by a low FEV1/FVC (forced expiratory volume in one second/forced vital capacity) ratio,1 with a ratio <0.70 confirming a diagnosis of pathological airflow limitation. [...]

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