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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

["Eosinophils help protect your body from harmful substances and infections, but elevated levels may signal allergies, infections, or other conditions."]

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

Key facts at a glance

LOINC
87321-6
Short code
ETEC sta gene Islt Ql NAA+probe
Synonyms
ETEC sta gene Islt Ql NAA+probe
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
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 Is Done

Your doctor may order this test to investigate symptoms like persistent itching, skin rashes, asthma, or unexplained infections. It can also help diagnose conditions such as allergies, parasitic infections, or certain blood disorders.

What to Expect Before the Test

No special preparation is needed. You may have a simple blood draw from your arm, similar to getting an insulin shot. The process is quick and usually painless.

What the Results Mean

Results are reported as the absolute number of eosinophils per microliter (µL) of blood. High levels (above normal) may indicate allergies, asthma, parasitic infections, or other inflammatory conditions. Low levels may suggest immune suppression or certain blood disorders.

Common Conditions Linked to Eosinophil Levels

Elevated eosinophil counts are often seen in allergic reactions, asthma, parasitic infections (e.g., hookworm, strongyloidiasis), certain cancers (e.g., lymphoma), and autoimmune diseases. Low eosinophil counts can occur with immune deficiencies or certain medications.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Eosinophil blood count

Frequently asked questions

What might cause my eosinophil count to be high?
High eosinophil counts can result from allergies, asthma, parasitic infections, or other inflammatory conditions. Your doctor may also check for hidden infections or autoimmune disorders if levels are persistently elevated.
Can diet or supplements affect eosinophil levels?
Dietary changes alone rarely affect eosinophil counts, but certain medications (e.g., steroids, antihistamines) or supplements (e.g., omega-3s) may influence immune responses indirectly. Always discuss supplements with your doctor.
How often should I get this test?
Your doctor will determine how often to check this test based on your symptoms, medical history, and treatment plan. Regular monitoring may be needed if you have ongoing allergies, asthma, or other conditions 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