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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 levels can help diagnose or monitor conditions like allergies, infections, or certain blood disorders."]

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

Key facts at a glance

LOINC
6574-8
Short code
E coli VTN1 Stl Ql
Synonyms
E coli VTN1 Stl Ql
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 Is Done

Doctors may order this test to investigate symptoms such as persistent itching, skin rashes, asthma, or unexplained weight loss. It can also help diagnose conditions like parasitic infections, certain cancers, or allergic reactions that affect the blood or organs.

What to Expect Before the Test

No special preparation is needed. You’ll have a small needle inserted into your arm or hand to draw blood. The process usually takes a few minutes, and you may feel a slight pinch or discomfort.

What the Results Mean

Elevated eosinophil levels may indicate allergies, infections, or inflammatory conditions. Lower-than-normal levels might suggest certain blood disorders or immune system issues. Your doctor will interpret results in relation to your symptoms and medical history.

Common Conditions Linked to Eosinophil Levels

High eosinophil counts can be linked to conditions like asthma, allergic reactions, parasitic infections, or certain autoimmune diseases. Low levels may be associated with conditions like aplastic anemia or other blood disorders.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Eosinophil blood count

Frequently asked questions

What causes eosinophils to be high?
Elevated eosinophils can result from allergies, asthma, parasitic infections, certain cancers (like lymphoma), or inflammatory diseases. Stress, medications, or other immune reactions may also trigger temporary spikes.
What if my eosinophil count is low?
Low eosinophil counts may indicate blood disorders (such as aplastic anemia), immune deficiencies, or certain infections. Your doctor will review your symptoms and other test results to determine the cause.
How often should I get this test?
Frequency depends on your symptoms and medical condition. Your doctor may recommend retesting if you have ongoing health concerns or if you’re being treated for a condition linked to eosinophils.
  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