Understanding Lab Tests for Eosinophilia
Written by Private MD Labs Medical Writing Team • Last Updated: September 8, 2025
Eosinophilia is a condition characterized by higher than normal levels of eosinophils, a type of white blood cell that plays a role in the body's immune response. This elevation can occur in response to various conditions including allergic disorders, asthma, parasitic infections, autoimmune diseases, and certain types of cancer.
Recommended Test
Complete Blood Count / CBC (includes Differential and Platelets)
This comprehensive blood test is the primary diagnostic tool for detecting eosinophilia. The CBC with differential provides an exact count and percentage of eosinophils, allowing healthcare providers to determine if levels are elevated above the normal range. This test can detect eosinophilia caused by various factors including allergies, asthma, autoimmune diseases, parasitic infections, skin conditions, endocrine disorders, and certain types of cancer.
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Diagnosing Eosinophilia with Blood Testing
Eosinophilia is definitively diagnosed through blood testing that measures the exact number and percentage of eosinophils in your blood. Since symptoms can be subtle or overlap with other conditions, accurate laboratory measurement is essential for proper diagnosis and determining the underlying cause.
Understanding Your Results
Normal eosinophil levels typically range from 1-4% of total white blood cells or 50-500 cells per microliter of blood. Elevated levels may indicate an underlying condition that requires further investigation and treatment. Your healthcare provider will interpret your results in the context of your symptoms and medical history.
Important Considerations
The information here is for educational purposes only and is not a substitute for professional medical advice. Always consult with a healthcare provider for diagnosis and treatment.
