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Antigen Rapid Test for SARS-CoV-2 (Qualitative)

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

This test detects the presence of SARS-CoV-2 antigens in your saliva, helping healthcare providers quickly identify if you have an active COVID-19 infection.

Quick summary

["A rapid screening tool for active COVID-19 infection using saliva samples."]

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

Key facts at a glance

LOINC
94811-7
Short code
COVID-19 Intub Eval note
Synonyms
COVID-19 Intub Eval note
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
role
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 saliva sample to detect specific proteins (antigens) from the virus that causes COVID-19. If the virus is present, the test may show a positive result, indicating an active infection.

What to Expect During the Test

You’ll provide a small saliva sample, typically swabbed inside your mouth. The result is usually available in minutes, with instructions provided by healthcare staff.

When This Test Is Used

This test is often used for rapid screening in healthcare settings, community testing programs, or when immediate results are needed to guide decisions about isolation or treatment.

Limitations and Considerations

While useful for detecting active infections, this test may not detect early or mild cases. It’s best used alongside other testing methods or clinical judgment for accurate diagnosis.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

COVID-19 Antigen Test

Frequently asked questions

Why might my doctor order this test?
Your doctor may recommend this test if you have symptoms of COVID-19, are exposed to someone with the virus, or are in a setting where rapid screening is prioritized, such as schools, workplaces, or travel.
What does a positive result mean?
A positive result suggests you are currently infected with SARS-CoV-2 and may spread the virus to others. Follow healthcare guidance on isolation and treatment.
What if my result is negative but I still feel sick?
A negative result means the test did not detect the virus at the time of testing. If you continue to feel unwell, consult your healthcare provider for further evaluation, as symptoms may develop later or other causes could be present.
  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