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SARS-CoV-2 Antigen Qualitative Test, Upper Respiratory Specimen

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

This test detects the presence of SARS-CoV-2 antigens in your upper respiratory tract, helping identify if you may have an active COVID-19 infection.

Quick summary

["Quick, non-invasive screening for active COVID-19 infection using a nasal or throat swab sample."]

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

Key facts at a glance

LOINC
96119-3
Short code
SARS-CoV-2 Ag Upper resp Ql IA
Synonyms
SARS-CoV-2 Ag Upper resp Ql IA
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ia
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

The test uses a swab to collect a sample from your nose or throat. The sample is then analyzed to detect specific proteins (antigens) from the virus. If these proteins are present, it suggests you may be currently infected with COVID-19.

Sample Collection

You will likely be asked to blow your nose gently or use a swab to collect a sample from your upper respiratory tract. This is a quick and painless process.

What to Expect After Testing

Results are typically available within 15 minutes. If you test positive, follow your healthcare provider’s guidance on next steps, such as isolation or treatment.

When This Test Might Be Used

This test is commonly used for rapid screening in high-risk settings like healthcare facilities, community events, or when symptoms of COVID-19 are suspected.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

SARS-CoV-2 Antigen Screen (Nasal/Swab)

Frequently asked questions

How soon after exposure can I get a positive result?
Antigen tests are most accurate when taken within the first few days of symptoms or exposure. They may not detect infection as early as molecular tests (like PCR), so results should be interpreted alongside clinical judgment.
Can I use this test at home?
Yes, some versions of this test are available over-the-counter for home use. However, professional testing may be required in certain settings or if you have symptoms.
What if my test is negative but I still feel sick?
A negative result means the test did not detect detectable viral antigens at the time of testing. If you continue to feel unwell, consult your healthcare provider, as other causes of illness could be present or the infection may be too early or too late for detection by this 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