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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 immune response and inflammation."]

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

Key facts at a glance

LOINC
11152-6
Short code
Eosinophil NFr Mar
Synonyms
Eosinophil NFr Mar
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why Do I Need This Test?

Your healthcare provider may order this test if you have symptoms like persistent itching, skin rashes, asthma, or unexplained weight loss. It can also help evaluate conditions like allergies, parasitic infections, or certain cancers.

What to Expect During the Test

A small blood sample is taken from a vein, usually in your arm. The process is quick and typically painless. The sample is then analyzed to count your eosinophil cells.

Common Conditions Monitored

Elevated eosinophil counts may indicate allergies, asthma, parasitic infections, or autoimmune diseases. Low counts might suggest immune deficiencies or certain infections.

How Results Are Interpreted

Results are compared to standard ranges for healthy adults. While absolute eosinophil counts vary by age and health, your provider will discuss what your specific results mean for you.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Eosinophil CBC

Frequently asked questions

What causes eosinophils to be high?
Elevated eosinophils can result from allergies, asthma, parasitic infections, certain cancers (like leukemia), or autoimmune disorders. Your provider may also check for other symptoms or conditions.
How long does it take to get results?
Results are usually available within 1–3 business days, depending on lab processing times. Follow-up with your healthcare provider to discuss findings and next steps.
Can lifestyle changes affect eosinophil levels?
Diet, stress, or certain medications (like antihistamines) may influence white blood cell counts temporarily. Avoiding recent infections or allergens before testing can help ensure accurate results.
  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