Spirometry interpretation algorithm: Primary Care Respiratory Alliance of Canada Asthma vs COPD (history)Consistent with asthma Refer to specialist  FEV1, 12% and 200mL Restrictive disorder Reduced < LLNNormal (not COPD) FVC ≥ 80% predicted  FEV1 and  FVC ß2-agonist Reduced < LLNNormal > LLN Pre ß2-agonist FEV1/FVC ratio Modified from Primary Health Care Alliance of Canada spirometry interpretation algorithm 2011
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