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: Eosinophil Count, Nasal Fluid (Qualitative)

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

: This test examines a sample of nasal fluid for the presence of eosinophils, a type of white blood cell often linked to allergic inflammation.

Quick summary

[": A positive result suggests eosinophil-associated allergic inflammation in the nasal passages."]

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

Key facts at a glance

LOINC
17834-3
Short code
Eosinophil NFr Snv
Synonyms
Eosinophil NFr Snv
Category
chemistry
Sample
fluid
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
2-5 mL
Stability
Room temperature: 2h, Refrigerated: 24h
Hemolysis max
300
TAT
4–24 hours
Order
routine

: What This Test Measures

: A sample of nasal fluid or nasal mucus is collected, typically using a swab or nasal wash, and examined in the laboratory for eosinophils. Eosinophils are white blood cells that increase in number during certain allergic and inflammatory responses.

: Why Your Provider May Order It

: This test is often ordered to help evaluate nasal symptoms such as persistent runny nose, sneezing, or congestion. It can help distinguish allergic causes of nasal inflammation from other causes.

: How the Sample Is Collected

: Collection involves gently sampling nasal secretions, usually with a swab or a small nasal wash. The exact technique depends on your provider and laboratory; follow their instructions carefully.

: What Results Can Mean

: The presence of eosinophils in nasal fluid supports an allergic or eosinophil-driven process, while their absence does not entirely rule one out. Results are interpreted together with your symptoms and history.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

: Nasal eosinophilia is commonly associated with allergic rhinitis and other eosinophil-related nasal conditions. Because this is a qualitative-type assessment, results are typically reported as present or absent (or similar), and should be interpreted by your clinician alongside your symptoms, exposures, and other tests rather than in isolation.

Short name

: Nasal Eosinophils

Frequently asked questions

: Does a positive result mean I definitely have allergies?
: Not necessarily. It suggests eosinophil-associated inflammation, which is often allergic, but your provider will consider your symptoms and other findings before making a diagnosis.
: Is the collection painful?
: Sampling nasal fluid is usually quick and mildly uncomfortable rather than painful. Your provider will explain the specific method used.
: Can medications affect the result?
: Some medications, such as certain allergy or steroid treatments, may influence eosinophil findings. Tell your provider about all medicines you use before testing.
  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