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SARS-CoV-2 Antigen Rapid Test (Qualitative)

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

This test detects the presence of SARS-CoV-2 antigens in your saliva, which may indicate an active infection with the virus responsible for COVID-19.

Quick summary

["A quick, at-home test to check for recent COVID-19 infection."]

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

Key facts at a glance

LOINC
94558-4
Short code
SARS-CoV-2 Ag Resp Ql IA.rapid
Synonyms
SARS-CoV-2 Ag Resp Ql IA.rapid
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-rapid
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) produced by the virus when it’s actively multiplying in your body. If the test line appears, it suggests you may have a current infection. Results are typically ready in about 15 minutes.

What to Expect Before the Test

No special preparation is needed. Collect a small amount of saliva by spitting into the provided collection tube. Follow the instructions provided with the test kit to ensure accurate results.

Limitations of This Test

This test is designed to detect recent infection and may not identify all cases of COVID-19. It is not used for diagnosing past infection or confirming recovery. False negatives can occur if the virus is not actively present in your saliva at the time of testing.

When to Follow Up

If you receive a positive result, contact your healthcare provider immediately for further evaluation and guidance. If you get a negative result but still feel unwell, consider other diagnostic tests or consult your doctor.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

SARS-CoV-2 Antigen Screen

Frequently asked questions

This test is useful for rapid screening in settings where immediate results are needed, such as before gatherings or travel. It helps identify people who may need isolation or additional testing to prevent the spread of COVID-19.
This test is not a substitute for a full diagnostic PCR test, which can detect genetic material from the virus for more accurate confirmation of infection.
Can I use this test if I’ve already been vaccinated?
Yes, this test can be used even if you’ve been vaccinated. However, vaccinated individuals may have lower viral loads and could still test positive if infected.
How accurate is this test?
The accuracy of rapid antigen tests varies. They are generally less sensitive than PCR tests, meaning they may miss some infections, especially if tested too early or too late in the course of illness.
  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