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BackgroundSputum eosinophilia has been shown to be a predictor of response to anti‐eosinophil therapies in patients with airway diseases. However, quantitative cell counts and differentials of sputum are labor intensive. The objective of this study was to validate a novel ELISA‐based assay of eosinophil peroxidase (EPX) in sputum as a rapid and reliable marker of airway eosinophils.
MethodsThe utility...
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