wbc
Eosinophils
Eosinophils are reported as a white blood cell measurement in 10^9/L.
- Short name
- EOS
- Unit
- 10^9/L
- Reference min
- 0.02
- Reference max
- 0.5
- Optimal min
- 0.05
- Optimal max
- 0.3
- Better when
- in range
- Reference min (male)
- 0.02
- Reference max (male)
- 0.5
- Reference min (female)
- 0.02
- Reference max (female)
- 0.5
- Sample
- whole blood
- Fasting required
- false
- Related markers
- White Blood Cells, Total IgE
Moved by
Interventions that trials measured against this marker, and which way it moved.No trial has measured Eosinophils against an intervention in this library yet.
Full write-up
What is it
Eosinophils are a type of white blood cell. This biomarker reports the amount of eosinophils measured in blood, helping describe their level as part of a white blood cell assessment.
How to test it
Eosinophils are measured from a whole-blood sample. This means the test requires blood collection in the sample type specified for the measurement, with the result reported using the unit shown alongside the test. Interpretation should use the reference and optimal ranges provided with the result rather than values from an unrelated source.
Fasting is not required for this measurement. A fasting appointment is therefore not needed solely to assess eosinophils, although other tests collected at the same visit may have their own preparation requirements.
When arranging or reviewing the test, the result can be considered alongside the related markers identified on the page, including White Blood Cells and Ige Total, when those markers are also measured. A clinician can explain how the eosinophil result fits with the reason for testing and any other findings.
Reading your result
Eosinophils are assessed from a whole-blood sample and reported in the unit shown on the laboratory report. Read the result against the reference range printed on that report, rather than comparing it with a range from another laboratory. Laboratories may use different ranges and units, so the same number can be interpreted differently depending on the report that accompanies it.
The reference range describes the laboratory’s usual comparison interval. The optimal range is narrower and represents a tighter range for interpretation; being within the reference range does not necessarily mean the result is within this narrower range. These ranges are reference tools, not standalone diagnoses.
A single eosinophil value should be considered alongside the clinical context and any other relevant findings. Fasting is not required for this measurement, but an individual result can still be affected by factors surrounding testing and by the broader health context. An out-of-range result is best discussed with a clinician, who can determine whether it is meaningful and whether follow-up is appropriate.