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Eosinophil Count (Electrophoresis Method)

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 certain infections and respond to allergies and inflammation.

Quick summary

["Eosinophil counts help identify conditions affecting immune response or inflammation."]

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

Key facts at a glance

LOINC
34726-0
Short code
Eosinophil #/area Prt HPF
Synonyms
Eosinophil #/area Prt HPF
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
microscopy-light-hpf
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 healthcare provider may order this test if you have symptoms like persistent cough, skin rashes, digestive issues, or unexplained fatigue. It could also be used to monitor conditions such as allergies, asthma, parasitic infections, or certain cancers like leukemia.

What to Expect Before the Test

No special preparation is needed for this blood test. You may have a small needle inserted into your arm to draw blood, which usually causes only minor discomfort. If you’re on blood thinners, let your provider know before the test.

What the Results Mean

Eosinophil counts are typically reported as the absolute number of eosinophils per microliter (µL) of blood. High levels may suggest allergic reactions, infections, or inflammatory conditions, while very low levels might indicate immune system issues or certain medications.

Common Conditions Affecting Eosinophils

Elevated eosinophil counts can be linked to conditions like asthma, eosinophilic esophagitis, parasitic infections, certain cancers, or autoimmune disorders. Low counts may be associated with viral infections, immune deficiencies, or medications that suppress white blood cells.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Eosinophil Count

Frequently asked questions

How long does it take to get my test results back?
Results are usually available within 1 to 3 business days, depending on your lab. Follow up with your healthcare provider to discuss the findings and next steps.
Can I eat or drink before this test?
No dietary restrictions apply for this test. You can eat and drink normally as usual.
What if my eosinophil count is outside the normal range?
If your count is high, your provider may investigate potential causes like allergies, infections, or other underlying conditions. If low, further testing may be needed to check for immune issues or medication effects.
  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