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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 certain infections and respond to allergies and inflammation.

Quick summary

["Eosinophils help your body defend against parasites and allergens, but high or low levels may signal health concerns."]

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

Key facts at a glance

LOINC
22609-2
Short code
E coli VTN2 Ab Titr Stl
Synonyms
E coli VTN2 Ab Titr Stl
Category
chemistry
Sample
stool
Container
Clean container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
5 g
Stability
Refrigerated: 24h, Frozen: 7d
TAT
4–24 hours
Order
routine

Why This Test Might Be Ordered

Your healthcare provider may order this test if you have symptoms like persistent itching, skin rashes, asthma, or unexplained allergies. It could also be checked after exposure to allergens, parasites, or during evaluation for conditions like eosinophilic esophagitis, asthma, or certain cancers.

What to Expect Before the Test

No special preparation is needed. A simple blood draw from a vein in your arm is all that’s required. The test is usually done in a lab setting and results are ready within a few days.

What the Results Mean

Eosinophil counts are typically reported as absolute numbers (cells per microliter). High levels may indicate allergic reactions, infections by parasites, or certain autoimmune or inflammatory conditions. Low levels might suggest immune deficiencies or other underlying health issues.

Common Conditions Linked to Eosinophil Levels

Elevated eosinophil counts are often seen in conditions like allergic reactions, asthma, eosinophilic esophagitis, parasitic infections, and certain types of cancer (e.g., leukemia). Low levels can be associated with immune disorders or chronic infections.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Eosinophils in Diagnosis and Monitoring

Short name

Eosinophil CBC

Frequently asked questions

What causes my eosinophil count to be high?
High eosinophil counts can result from allergies, asthma, parasitic infections, certain cancers, or autoimmune diseases. If you have symptoms like persistent itching, skin rashes, or breathing difficulties, discuss these with your doctor to explore possible causes.
Can I adjust my diet or lifestyle to affect eosinophil levels?
While diet and lifestyle factors like stress or exposure to allergens can influence inflammation, they don’t directly change eosinophil counts. Focus on managing symptoms and follow your doctor’s advice for further evaluation if needed.
How often should I get this test?
Your doctor will determine the frequency based on your symptoms, medical history, and ongoing health needs. Regular monitoring may be recommended if you have chronic conditions like asthma or allergies.
  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