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Eosinophil count in whole blood (qualitative or semi-quantitative)

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

This test helps check the number of eosinophils, a type of white blood cell, in your blood. Eosinophils play a role in fighting certain infections and responding to allergies or inflammation.

Quick summary

["Assists in diagnosing conditions linked to abnormal eosinophil levels."]

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

Key facts at a glance

LOINC
16283-4
Short code
E coli VTN Spec Ql
Synonyms
E coli VTN Spec Ql
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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, asthma, or unexplained allergies. It could also be used to monitor conditions such as parasitic infections, certain cancers, or autoimmune disorders where eosinophils are elevated.

What to Expect Before the Test

No special preparation is needed. You may have a simple blood draw, usually from a vein in your arm. The process is quick and typically painless.

What the Results Mean

Results are qualitative (yes/no) or semi-quantitative, indicating whether eosinophil levels are elevated or within normal ranges. High levels might suggest allergies, infections, or other underlying conditions.

Common Conditions Linked to Eosinophil Levels

Elevated eosinophils can be linked to allergies, asthma, parasitic infections, certain cancers (like lymphoma or leukemia), or autoimmune diseases. Low levels may indicate stress, infections, or other inflammatory conditions.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Eosinophil test

Frequently asked questions

What does a positive or abnormal eosinophil test result mean?
An abnormal result (elevated eosinophils) may point to conditions like allergies, infections, or certain diseases. Your doctor will discuss the results with you and may recommend further testing or treatments based on your symptoms and medical history.
How often will I need this test?
The frequency depends on your health condition and treatment plan. Your doctor will let you know if follow-up tests are needed, such as every few months or as part of ongoing monitoring.
Can I eat or drink anything before the test?
No special diet or fasting is required for this test. You can eat and drink normally before your 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