A 58-year-old female with Asthma-COPD Overlap Syndrome has a history of repeated exacerbations despite being on inhaled corticosteroids and long-acting beta-agonists
A 58-year-old female with Asthma-COPD Overlap Syndrome has a history of repeated exacerbations despite being on inhaled corticosteroids and long-acting beta-agonists.
Which of the following investigations is most appropriate to guide further management by determining the level of eosinophilic inflammation?
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