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Eosinophil Count (Qualitative or Semi-Quantitative)

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

This test evaluates the presence and relative amount of eosinophils, a type of white blood cell, in your blood. Eosinophils help the body fight certain infections and respond to allergies.

Quick summary

Eosinophils help manage allergic reactions and infections; this test checks their level in your blood.

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

Key facts at a glance

LOINC
71613-4
Short code
Eosinophil NFr.DF Plr Manual
Synonyms
Eosinophil NFr.DF Plr Manual
Category
chemistry
Sample
fluid
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
manual-count
Specimen volume
2-5 mL
Stability
Room temperature: 2h, Refrigerated: 24h
Hemolysis max
300
TAT
4–24 hours
Order
routine

Why This Test Is Done

Your healthcare provider may order this test to diagnose or monitor conditions like allergies, asthma, parasitic infections, or certain blood disorders. It can also help assess responses to treatments or identify unexplained symptoms such as persistent itching, skin rashes, or digestive issues.

What to Expect Before the Test

No special preparation is needed. You may have a simple blood draw from a vein in your arm, similar to other routine blood tests. If you’re taking blood thinners or have a history of bleeding disorders, let your provider know.

What the Results Mean

Results are typically qualitative (qualitative) or semi-quantitative, meaning they describe presence/absence or relative levels rather than exact numbers. High eosinophil counts may suggest allergies, infections, or inflammatory conditions. Low levels might indicate immune suppression or other underlying issues.

Common Conditions Monitored

Eosinophil tests are often used to track conditions like severe allergies, eosinophilic esophagitis, certain lung diseases (e.g., eosinophilic pneumonia), or parasitic infections. They can also help guide decisions about medications or further testing.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Eosinophil Test

Frequently asked questions

What does a high eosinophil count mean?
A high eosinophil count can signal conditions like allergies, asthma, parasitic infections, or inflammatory diseases. It may also appear in certain cancers or autoimmune disorders. Your provider will consider your symptoms, medical history, and other test results to interpret results accurately.
What does a low eosinophil count mean?
Low eosinophil counts may indicate immune suppression, certain infections (like viral or bacterial), or medications that suppress white blood cell production. It can also be seen in rare genetic disorders. Your provider will review your overall health and other test results to understand the cause.
Is this test painful?
The blood draw itself may cause mild discomfort or bruising at the site, but it’s generally quick and well-tolerated. Most people don’t experience significant pain. If you’re anxious, let your provider know about any concerns.
  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