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Fluorescent Antibody Titration for Viral Antigen (e.g., Influenza)

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

This test detects specific proteins from certain viruses, including influenza, in your respiratory secretions. It helps determine if you have an active infection.

Quick summary

["Quickly identifies viral infections in nasal or throat swabs to guide treatment decisions."]

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

Key facts at a glance

LOINC
22365-1
Short code
FLUAV Ab Titr Ser
Synonyms
FLUAV Ab Titr Ser
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

How the Test Works

A swab is collected from your nose or throat. The sample is then tested in a lab using a fluorescent antibody technique. If the virus is present, antibodies will bind to it, and a light-sensitive detector can identify this binding, indicating a positive result.

What to Expect Before the Test

No special preparation is needed. You may experience mild discomfort from the swab, but it usually takes only a few seconds. If you have a cold or respiratory symptoms, this test can be done at the same time as other diagnostic tests.

Possible Results and Interpretation

A positive result means the virus proteins are present, suggesting an active infection. A negative result means the virus was not detected in the sample. Results should be interpreted by your healthcare provider in the context of your symptoms and medical history.

When This Test Might Be Used

Your doctor may recommend this test if you have symptoms like cough, sore throat, fever, or nasal congestion, especially during flu season. It can also be used to confirm a suspected viral infection in patients with other symptoms.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Influenza Antigen Fluorescent Antibody Test

Frequently asked questions

Why is this test important?
This test helps quickly identify influenza and other respiratory viruses, allowing for prompt treatment with antiviral medications if needed. Early diagnosis can reduce the severity of illness and help prevent the spread of infection to others.
What does a positive result mean?
A positive result indicates the presence of the virus in your respiratory tract, confirming an active infection. This can help your doctor determine the best course of treatment and monitor your recovery.
Can this test be used for other viruses?
Yes, this test can be adapted to detect other viral antigens, including some coronaviruses and other respiratory viruses, depending on the specific antibody used in the test.
  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