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Eosinophil Count (Qualitative Blood Evaluation)

Published: August 9, 2026Updated: August 16, 2026

This test measures the presence and quantity of eosinophils, a type of white blood cell that plays a role in fighting certain infections and allergic reactions.

Quick summary

["Eosinophils help identify conditions affecting your immune system or allergies."]

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

Key facts at a glance

LOINC
71674-6
Short code
Eosinophil NFr.DF Bld Manual
Synonyms
Eosinophil NFr.DF Bld Manual
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
manual-count
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why This Test Is Done

Doctors may order this test to diagnose or monitor conditions such as allergic reactions, parasitic infections, asthma, certain cancers (like leukemia), or other immune-related disorders. It can also help assess how well your body is responding to treatments for these conditions.

What to Expect Before the Test

No special preparation is needed. You’ll have a small needle inserted into your arm to draw a blood sample. This usually takes a few minutes. If you’re nervous, let your healthcare provider know—they can help make it more comfortable.

What to Expect During the Test

The blood sample is sent to a lab where it’s examined under a microscope to count eosinophils. The result is qualitative (yes/no or low/high) rather than a specific number, as it focuses on identifying abnormal levels.

Possible Results and Their Meaning

If your test shows an elevated eosinophil count, it may indicate an allergic reaction, infection, or another condition affecting your immune system. A normal result doesn’t rule out all causes—other tests may be needed for diagnosis.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Eosinophil counts are important for diagnosing and managing conditions like allergic disorders, parasitic infections, and certain blood cancers. High levels often signal chronic inflammation or immune responses, while low levels may suggest immune suppression or other underlying issues.

Short name

Eosinophil Test

Frequently asked questions

What does an elevated eosinophil count mean?
An elevated count may suggest conditions like allergies, asthma, parasitic infections, or certain cancers. Your doctor will discuss possible causes and next steps with you.
How long does it take to get results?
Results are typically available within 1–3 business days, depending on your lab. Your doctor will contact you once they’re ready.
Can I eat or drink before this test?
No special diet or fasting is required. You can eat and drink normally before the blood draw.
  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