Eosinophils levels: what's normal, high and low
White blood cells involved in allergic responses and parasitic infections.
Medically reviewed by Youmna DiStefano, MD · Last reviewed September 2026
The short answer
Eosinophils is measured with a standard blood draw; no fasting is needed. A typical reference range is 1.00 – 4.00 %. At TestWell it's $21.99 all-in as CBC with Differential, results in 1–3 business days, drawn at Quest or Labcorp. An out-of-range result is a prompt to look closer, not a diagnosis.
- Units
- %
- Sample
- Blood draw
- Fasting
- Not required
- Results
- 1–3 business days
- Price
- $21.99
- Labs
- Quest or Labcorp · BioReference in NY/NJ
Eosinophils Reference Range
These are the typical adult reference ranges used by major US labs. Your report will include the specific range used by the lab that processed your sample.
| Population | Range |
|---|---|
| age 18+ | 1.00 – 4.00 % |
Reference ranges are educational. Always interpret your result with the specific range printed on your lab report and discuss anything outside the range with a clinician.
What your Eosinophils result may mean
Often reflects allergies, asthma, parasites, or certain medications.
What a high Eosinophils means: causes, symptoms, next steps →Educational only — not a diagnosis. Many factors can influence a single result. Discuss anything that concerns you with a healthcare provider.
How do you get a Eosinophils test?
Order online, a licensed physician reviews the requisition, and you walk into a nearby lab for the draw. Eosinophils is available on its own or inside these panels — panels cost less per marker when you want the fuller picture.
| Option | Includes | Price |
|---|---|---|
| CBC with Differential | This marker only | $21.99 |
| Baseline Anemia Panel | 5 tests | $74.99 |
| General Wellness Panel | 4 tests | $89.99 |
| Fatty Liver Panel | 6 tests | $92.99 |
| Post-COVID Recovery Panel | 7 tests | $99.99 |
Quest vs. Labcorp for Eosinophils: which lab should you pick?
Both are CLIA-certified national labs and the result is clinically equivalent, so pick whichever location is closer. Your report will print that lab's own reference range, which can differ slightly from the table above.
| Lab | Available | Price |
|---|---|---|
| Quest Diagnostics | Yes | $21.99 |
| Labcorp | Yes | $21.99 |
| BioReference (NY & NJ) | Yes | $18.99 |
Need help choosing a location? Use the lab finder to see draw sites near your ZIP.
Related Blood Health biomarkers
Markers commonly tested alongside Eosinophils.
Frequently asked
Often reflects allergies, asthma, parasites, or certain medications. A single result above the reference range is a prompt to look closer with a clinician — often a repeat test and related markers — not a diagnosis on its own.
Ready to test your eosinophils?
Order in two minutes, get physician-approved, and visit a lab the same day. Starts at $21.99.