Low Absolute Eosinophil Counts: Clinical Significance and Evaluation

Understanding Normal Eosinophil Levels

• Normal absolute eosinophil counts typically range from 50-500 cells/μL, with values below 50 cells/μL considered low 1

Clinical Significance of Low Eosinophil Counts

• Corticosteroid therapy significantly reduces blood eosinophil counts in most patients 2, 3

Key Considerations for Interpretation

• Isolated low eosinophil counts without clinical symptoms generally do not require further investigation 1, 3
• Eosinophil counts can be artificially lowered by recent corticosteroid use 2, 3
• The American Thoracic Society and other guideline societies recommend considering eosinophil counts as part of a comprehensive clinical assessment, rather than using them alone for diagnosis 2, 4