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Eosinophil count (absolute)

Published: August 9, 2026Updated: August 16, 2026

This test measures the number of eosinophils, a type of white blood cell, in your blood. Eosinophils help fight infections and respond to allergies and inflammation.

Quick summary

["Understanding your eosinophil count can help identify potential infections, allergies, or inflammatory conditions."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
50341-7
Short code
Eosinophil Spt Ql Hansel Stn
Synonyms
Eosinophil Spt Ql Hansel Stn
Category
chemistry
Sample
sputum
Container
Sterile sputum container
Units
N/A
Ref low
0.8
Ref high
1.2
Critical range
— – 5 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
hansel-stain
CPT
85610
SNOMED
396252006
Specimen volume
3-5 mL
Stability
Room temperature: 2h, Refrigerated: 24h
TAT
4–24 hours
Order
routine

Why This Test Is Done

Doctors may order this test to diagnose or monitor conditions such as allergies, asthma, parasitic infections, certain cancers (like leukemia), or inflammatory diseases. It can also help assess how well treatment is working.

What to Expect Before the Test

No special preparation is needed. The test involves a simple blood draw from a vein, usually in your arm. You may feel a slight pinch, but it should only take a few minutes.

What the Results Mean

Results are typically reported as the absolute number of eosinophils per microliter (µL) of blood. Higher than normal levels may suggest allergies, infections, or other conditions affecting eosinophil production or activity.

Common Conditions Affecting Eosinophil Levels

Elevated eosinophil counts are often linked to allergic reactions, parasitic infections, certain lung diseases (like asthma or eosinophilic pneumonia), or autoimmune conditions. Low levels may indicate immune suppression or other underlying health issues.

Reference range

INR: 0.8-1.2 (warfarin: 2.0-3.0)N/A

Specimen: sputum

Inform your healthcare provider if you are taking blood thinners. No special preparation required.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Eosinophil counts are critical for diagnosing and managing conditions where these cells play a key role. For example, high eosinophils may guide treatment for allergies or parasitic infections, while monitoring trends can help assess response to therapy.

Short name

Eosinophil level

Frequently asked questions

What causes eosinophils to be high?
Elevated eosinophils can result from allergies, asthma, parasitic infections, certain cancers (like Hodgkin lymphoma), or inflammatory conditions. Your doctor may also check levels if you have symptoms like persistent itching, skin rashes, or unexplained fatigue.
When might my doctor order this test?
Your doctor could recommend this test if you have symptoms like chronic coughing, unexplained weight loss, or signs of an allergic reaction. It may also be part of routine monitoring for certain chronic illnesses or before starting treatments that affect the immune system.
Are there any risks or side effects from this test?
The most common side effect is a mild bruise or slight pain at the injection site. Rarely, there may be a slight swelling or redness. Most people experience no serious complications from this simple blood test.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy