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Some patients share characteristics of both COPD and asthma. As yet, there is no gold standard to identify patients with the so-called asthma-COPD overlap syndrome (ACOS).

Is a previous diagnosis of asthma a reliable criterion for asthma&ndash;COPD overlap syndrome in&nbsp;a patient with COPD?

Is a previous diagnosis of asthma a reliable criterion for asthma–COPD overlap syndrome in a patient with COPD?