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Eosinophil count (qualitative blood smear evaluation)

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

This test measures the presence and proportion of eosinophils, a type of white blood cell, in your blood using a microscopic examination of a blood sample.

Quick summary

["Eosinophils help identify certain immune responses or conditions affecting your blood or organs."]

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

Key facts at a glance

LOINC
48710-8
Short code
Eosinophil Spec Ql Micro
Synonyms
Eosinophil Spec Ql Micro
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
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 recommend this test if you have symptoms like persistent itching, skin rashes, allergic reactions, chronic lung issues, or unexplained weight loss. It could also be used to monitor conditions like asthma, parasitic infections, or certain cancers.

What to Expect Before the Test

No special preparation is needed. You’ll have a small needle inserted into your arm to draw blood. It usually takes a few minutes, and you may feel a brief pinch. If you’re on blood thinners, let your provider know before the test.

What the Test Results Mean

Results are qualitative, meaning they describe whether eosinophils are present above or below normal levels rather than providing a specific number. Elevated levels may suggest allergies, infections, or inflammatory conditions.

Common Conditions Monitored

High eosinophil counts can be linked to allergies, parasitic infections, certain lung diseases (like eosinophilic pneumonia), or autoimmune disorders. Low levels might indicate infections or other immune system issues.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Eosinophil check

Frequently asked questions

Why do I need this test?
Your doctor may order this test to diagnose or monitor conditions affecting eosinophils, such as allergic reactions, parasitic infections, or chronic inflammatory diseases. It helps guide treatment decisions.
What does an abnormal result mean?
An abnormal result (either high or low eosinophil count) may signal an underlying condition requiring further evaluation. Your provider will discuss findings with you and may recommend additional tests or treatments.
Can I eat or drink before this test?
No dietary restrictions apply. You can eat and drink normally, but avoid blood-thinning foods (like leafy greens) if you’re on certain medications, as they may affect blood clotting.
  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