Eosinophils (count and %) is a blood test that measures eosinophils (count and %) levels in the blood. Normal range: Eosinophils are normally about 0-0.5 x10^9/L. A count above this (eosinophilia) is graded mild, moderate or marked, with higher counts prompting a wider search for a cause.. It is commonly used to elevated in allergies, parasitic infections, and certain autoimmune conditions..
What is Eosinophils (count and %)?
A type of white blood cell involved in allergic responses and parasite defense.
Why is it measured?
Elevated in allergies, parasitic infections, and certain autoimmune conditions.
Normal Reference Range
Eosinophils are normally about 0-0.5 x10^9/L. A count above this (eosinophilia) is graded mild, moderate or marked, with higher counts prompting a wider search for a cause.
Note: Reference ranges may vary between laboratories. Always consult your healthcare provider for interpretation.
What Causes High EOSINOPHILS?
The classic causes of a high eosinophil count are allergic conditions — asthma, hay fever, eczema and drug reactions — and, worldwide, parasitic (worm) infections. In Australia, allergy and medication reactions are the most common everyday causes. Higher and persistent counts can reflect autoimmune and connective-tissue diseases, and, less commonly, eosinophilic disorders or blood cancers, which warrant specialist assessment.
What Causes Low EOSINOPHILS?
A low eosinophil count is common, expected during acute infection and physiological stress, and is also produced by corticosteroid treatment and Cushing's syndrome. It is not a cause for concern on its own.
How Often Should EOSINOPHILS Be Tested?
Eosinophils are reported in the differential of every full blood count. A mildly raised count is often explained by known allergy; a moderately or markedly raised count is investigated for parasites, drug causes and, if persistent, eosinophilic or haematological conditions.
Related Blood Markers
Eosinophils are interpreted with the rest of the white cell differential and total white cell count. Total IgE and allergy testing help in an allergic picture, and a blood film when counts are high or persistent.
Key Facts
- •Category: Blood Health
- •Unit of Measurement: 10^9/L
- •Test Code: EOSINOPHILS
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