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Eosinophil count in serum/plasma (qualitative probe)

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

This test uses a specialized probe to qualitatively assess the presence of eosinophils, a type of white blood cell involved in allergic reactions and certain infections.

Quick summary

["Eosinophil levels can help diagnose or monitor conditions like allergies, asthma, or parasitic infections."]

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

Key facts at a glance

LOINC
5003-9
Short code
EBV DNA Tiss Ql Probe
Synonyms
EBV DNA Tiss Ql Probe
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
probe
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

What This Test Measures

Eosinophils are a subtype of white blood cells that play a role in fighting off parasites and responding to allergic reactions. This test detects their presence in your blood using a specialized probe method, which provides a qualitative result rather than a numerical count.

When This Test Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms like persistent itching, skin rashes, asthma, or unexplained allergic reactions. It may also be used to evaluate conditions like eosinophilic esophagitis, certain infections, or autoimmune disorders.

What to Expect Before the Test

No special preparation is typically needed for this test. You may have a blood draw, where a small amount of serum or plasma is collected for analysis. The probe method does not require fasting or avoiding certain medications.

What the Results Mean

The result is qualitative, meaning it indicates whether eosinophils are present in your sample. Elevated levels may suggest an allergic reaction, infection, or other conditions requiring further medical evaluation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Eosinophil qual probe

Frequently asked questions

Why might my doctor want to check eosinophils?
Elevated eosinophil counts can signal conditions such as allergies, asthma, parasitic infections, or certain autoimmune diseases. This test helps guide treatment decisions and monitor disease activity.
How does this test differ from a full blood count (CBC) with eosinophil count?
This test uses a qualitative probe method, which provides a general indication of eosinophil presence without a precise count. A full CBC would give you a numerical eosinophil count, often used for more detailed analysis.
What if my results show elevated eosinophils?
If your results indicate elevated eosinophils, your doctor may recommend further testing or treatments to address the underlying cause, such as allergy medications, anti-parasitic drugs, or monitoring for conditions like eosinophilic esophagitis.
  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