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Eosinophil count in nasal fluid (mass concentration)

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

This test measures the number of eosinophils, a type of white blood cell, in nasal fluid. Eosinophils are involved in allergic reactions and certain inflammatory conditions.

Quick summary

["Understanding eosinophil levels in nasal fluid can help identify or monitor allergic or inflammatory conditions."]

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

Key facts at a glance

LOINC
57089-5
Short code
ECP Nasal fluid-mCnc
Synonyms
ECP Nasal fluid-mCnc
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

What Is Eosinophil Count in Nasal Fluid Used For?

Eosinophil counts in nasal fluid are primarily used to diagnose or evaluate conditions such as allergic rhinitis, nasal polyps, or other inflammatory nasal disorders. High levels may indicate an allergic response or chronic inflammation.

How Is This Test Performed?

A small sample of nasal fluid is collected using a sterile swab or similar device. The sample is then analyzed in a laboratory to count eosinophils under a microscope or via automated cell counting technology.

Preparation for the Test

No special preparation is needed for this test. You may rinse your nose gently with saline if needed to clear mucus, but avoid using nasal sprays or drops before sampling to prevent interference.

What Are Common Results and Their Meanings?

Results are typically reported as the number of eosinophils per microliter (µL) of nasal fluid. Elevated eosinophil counts may suggest an allergic reaction, asthma, or other inflammatory conditions. Normal or low levels may indicate no significant inflammation or allergy.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Frequently asked questions

Why might my doctor order this test?
Your doctor may order this test to diagnose or monitor conditions like persistent nasal allergies, nasal polyps, or other inflammatory nasal issues. It can help determine the cause of symptoms such as itching, sneezing, or nasal congestion.
What do abnormal results mean?
High eosinophil counts in nasal fluid often correlate with allergic reactions or chronic inflammation. If your results are abnormal, your doctor may recommend further testing or treatment options tailored to your condition.
How soon will I get my results?
Results are usually available within 1 to 3 business days, depending on your lab’s processing time. Your healthcare provider will discuss the results with you during your follow-up appointment.
  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