Eosinophils Percentage (Eosinophils %)
Haematology marker
Eosinophils Percentage
Eosinophils Percentage (Eosinophils %)
Category: Haematology
Unit: %
The proportion of white blood cells that are eosinophils, expressed as a percentage of the total. This relative differential value is distinct from the absolute eosinophil count and should be interpreted alongside it.
PED Notes
A relative value most useful when read with the absolute eosinophil count. Elevated eosinophil percentage most often reflects allergy or atopy, and sometimes parasitic infection or a drug/supplement reaction. Not directly affected by AAS, though new supplements and injectable excipients can occasionally trigger a reaction. Interpret alongside the absolute count and clinical history.
When high
When high (>6%):
- Most common cause is allergy or atopy (seasonal, food, or medication-related); consider parasitic infection with relevant travel or diet, and drug/supplement reactions
- Confirm with the absolute eosinophil count; a mildly raised percentage with known allergies is usually benign
- Supportive: quercetin 500mg 2x/day and vitamin C 1-2g/day (natural antihistamine effects), omega-3 2-3g/day; remove the allergen where identifiable
- A markedly raised absolute count or persistent elevation warrants investigation for parasitic infection or drug reaction
When low
When low (<1%):
- A low or zero eosinophil percentage is common and usually not clinically significant; it can occur with acute stress or corticosteroid effect
- No specific intervention is needed
History Chart
Reading History
Frequently Asked Questions
Reference Ranges
Standard Range
1 - 6 %