Although serum eosinophil levels can fluctuate over time, there is general agreement that a serum level > 300-400 cells/μL is an indicator of eosinophilia. The use of other biomarkers in combination with or in lieu of eosinophil counts may help to differentiate EA from NEA. For example, sputum and serum periostin levels, which reflect IL-13–related inflammation, are elevated in EA as compared with NEA.
Learn more about measuring eosinophils and other biomarkers for EA.
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Cite this: Zab Mosenifar. Fast Five Quiz: Eosinophilic Asthma - Medscape - Mar 17, 2023.