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Throat Swab Viral Detection by Immunoassay (Qualitative)

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

This test checks for the presence of certain viruses in a throat swab sample using an immunoassay method. It helps identify infections that may require medical attention or treatment.

Quick summary

["A quick way to detect viruses in your throat that could cause illness."]

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

Key facts at a glance

LOINC
31967-3
Short code
Gp B Strep Ag Throat Ql
Synonyms
Gp B Strep Ag Throat Ql
Category
coagulation
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 This Test Measures

The test detects specific viral antigens (proteins) from common respiratory viruses, including those that may cause colds, flu, or other infections. The immunoassay method detects these proteins if they are present in your throat swab sample.

How the Test Works

A swab is collected from your throat and tested in a lab. The immunoassay method uses antibodies to identify viral proteins. If the test is positive, it means the virus is likely present in your sample.

When You Might Need This Test

Your healthcare provider may recommend this test if you have symptoms like sore throat, cough, fever, or other signs of a respiratory infection. It can help determine if you need antiviral treatment or further testing.

Possible Results and Next Steps

A positive result indicates the presence of a virus that may require medical evaluation or treatment. A negative result means the virus was not detected in this sample, but symptoms could still be due to other causes or resolve on their own.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Viral throat swab test

Frequently asked questions

Why is this test important?
This test helps healthcare providers quickly identify viral infections in the throat, guiding decisions about treatment, isolation, or further diagnostic steps. It can also help monitor outbreaks or spread of certain viruses in communities.
What does a positive result mean?
A positive result suggests you may have an infection caused by one of the viruses tested. Your healthcare provider will discuss next steps, which may include antiviral medications, supportive care, or additional testing if needed.
Can I get false results?
Like any test, results can sometimes be affected by factors like sample collection, timing, or other health conditions. Your provider will interpret the result in the context of your symptoms and medical history.
  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