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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 caused by parasites and play a role in allergic reactions.

Quick summary

["Eosinophil levels can help diagnose or monitor conditions like allergies, asthma, or parasitic infections."]

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

Key facts at a glance

LOINC
92983-6
Short code
E coli DNA BAL NAA+non-prb-NCncRng
Synonyms
E coli DNA BAL NAA+non-prb-NCncRng
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
non-probe-amp-tar
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 This Test Might Be Ordered

Your doctor may recommend this test if you have symptoms such as persistent itching, skin rashes, asthma, or unexplained weight loss. It could also be used to check for conditions like eosinophilic esophagitis, certain cancers, or reactions to medications.

What to Expect Before the Test

No special preparation is needed. You’ll have a small needle inserted into your arm or vein to draw blood. This is a quick and usually painless procedure.

What the Results Mean

High eosinophil counts may indicate allergies, asthma, infections, or autoimmune diseases. Low counts might suggest certain blood disorders or immune system issues. Your doctor will interpret results in the context of your symptoms and medical history.

Common Conditions Monitored

Eosinophil counts are often checked in people with allergies, asthma, parasitic infections, or conditions like eosinophilic granulomatosis with polyangiitis (EGPA). They can also help track responses to treatments.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Absolute eosinophil count

Frequently asked questions

What does my test result tell me?
Your doctor will discuss your results with you, explaining whether they’re within normal ranges or if they suggest a specific condition. High levels might prompt further testing for allergies, infections, or other underlying issues.
Can I eat or drink before this test?
You can eat and drink normally before this blood test. No special diet or fasting is required.
How long will it take to get my results?
Results are typically available within a few days to a week, depending on your lab. Your doctor will contact you with the final report.
  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