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SARS-CoV-2 Antigen Qualitative Test (Saliva)

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

This test detects the presence of SARS-CoV-2 antigens in your saliva to help identify if you have an active infection with COVID-19.

Quick summary

["A quick, saliva-based test to check for active COVID-19 infection."]

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

Key facts at a glance

LOINC
105066-5
Short code
SARS-CoV+SARS-CoV-2 Ag Spec Ql
Synonyms
SARS-CoV+SARS-CoV-2 Ag Spec Ql
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

The test uses a saliva sample to look for specific proteins (antigens) from the virus that causes COVID-19. If these proteins are present, it suggests you may be currently infected.

What to Expect During the Test

You simply provide a small saliva sample using a provided swab or dropper. The test is usually done in about 15 minutes and does not require a blood draw or special preparation.

When This Test Might Be Used

Healthcare providers may recommend this test for people who have symptoms of COVID-19, are exposed to someone with the virus, or are in settings where testing is routinely offered.

Limitations and Considerations

This test is designed to detect active infection and may not detect past infections. It is most accurate when symptoms are present or shortly after exposure. False negatives can occur if the test is taken too early after exposure.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

SARS-CoV-2 Antigen Test (Saliva)

Frequently asked questions

Why might my doctor order this test?
Your doctor may order this test to quickly assess if you have an active COVID-19 infection, especially if you have symptoms like fever, cough, or difficulty breathing, or if you’ve been exposed to someone with COVID-19. It can help guide decisions about isolation, treatment, or further testing.
What does a positive result mean?
A positive result means the test detected proteins from the virus in your saliva, suggesting you are currently infected with COVID-19. You should follow your healthcare provider’s advice regarding isolation and treatment.
What does a negative result mean?
A negative result means the test did not detect proteins from the virus in your saliva at the time of testing. However, it’s possible you could still be infected if tested too early after exposure. If you develop symptoms later, you may need to get tested again.
  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