Objective To investigate the relationship between the eosinophil (Eos) percentage and levels of eosinophil cationic protein (ECP) in induced sputum and the severity of late onset asthma(LOA) and differential diagnosis.

• 目的探讨老年人晚发哮喘(LOA)患者诱导痰中嗜酸细胞和嗜酸细胞阳离子蛋白(ECP)水平与其严重程度的关系及与慢性阻塞性肺疾病(COPD)的鉴别诊断价值。