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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

["Eosinophil counts help diagnose and monitor conditions affecting your immune system."]

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

Key facts at a glance

LOINC
80196-9
Short code
EME Bld Ql Scn
Synonyms
EME Bld Ql Scn
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
screen
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

What is an eosinophil?

Eosinophils are a type of white blood cell that play a role in defending against parasites and managing allergic reactions and chronic inflammation. They are named for their distinctive red staining under a microscope.

Why might your doctor order this test?

Your doctor may recommend an eosinophil count if you have symptoms like persistent itching, skin rashes, asthma, or unexplained weight loss. It’s also used to check for conditions like allergies, parasitic infections, certain cancers (e.g., leukemia), or autoimmune disorders.

How is the test performed?

A small amount of blood is drawn from a vein, usually in your arm. The sample is then analyzed in a lab to count the eosinophils.

What do the results mean?

Results are typically reported as a count of eosinophils per microliter of blood. Elevated levels may suggest allergies, infections, or inflammatory conditions, while very low levels might indicate immune suppression or certain blood disorders.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Eosinophil blood test

Frequently asked questions

What causes high eosinophil levels?
High eosinophil counts can be caused by allergies, asthma, parasitic infections, certain cancers (like Hodgkin lymphoma), or inflammatory diseases. Chronic conditions like eosinophilic esophagitis or autoimmune disorders may also lead to elevated levels.
What causes low eosinophil levels?
Low eosinophil counts can result from immune system disorders, certain medications (e.g., steroids), or conditions that affect blood cell production (e.g., bone marrow disorders). Rarely, severe infections or stress can temporarily reduce their numbers.
How often should I get this test?
Your doctor will determine the frequency based on your symptoms, medical history, and treatment plan. Follow-up tests may be needed if your condition changes or if you’re undergoing treatment for a known eosinophil-related disorder.
  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