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SARS-CoV-2 Antigen Rapid Test (Qualitative)

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

This test detects the presence of a specific protein (antigen) from the virus that causes COVID-19 in your body fluids. It helps determine if you may have an active infection.

Quick summary

["A positive result suggests possible recent COVID-19 infection; a negative result means the test was not detected at this time."]

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

Key facts at a glance

LOINC
95209-3
Short code
SARS-CoV+SARS-CoV-2 Ag Resp Ql IA.rapid
Synonyms
SARS-CoV+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 rapid immunoassay method to identify SARS-CoV-2 antigens in your sample. Antigens are small parts of the virus that trigger an immune response. If the virus is present, the test detects these antigens within minutes.

Sample Collection

A nasal or throat swab is used to collect a sample. The swab is placed in a small solution to release the virus particles, which are then tested for antigens.

Test Results Interpretation

Results are typically available in 10–15 minutes. A positive result means the test detected SARS-CoV-2 antigens, which may indicate an active infection. A negative result does not rule out COVID-19, especially if symptoms persist.

When to Follow Up

If you have symptoms like fever, cough, or shortness of breath, follow your healthcare provider’s advice. A positive result may require further testing or isolation. A negative result should be confirmed with another test if symptoms continue.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

SARS-CoV-2 Antigen Test

Frequently asked questions

This test is used primarily for rapid screening in clinical settings, such as urgent care or emergency departments, to help identify active COVID-19 infections quickly. It is not as sensitive as PCR testing but provides faster results for initial assessment.
This test detects antigens from the virus itself, not antibodies produced by your immune system. It is most useful for identifying recent infections rather than past exposure.
How accurate is this test?
Rapid antigen tests are generally less accurate than PCR tests, especially in the early stages of infection. They may miss some infections or give false negatives if taken too early after exposure.
Can I use this test at home?
Yes, some versions of this test are available over-the-counter for home use. Follow the manufacturer’s instructions carefully for accurate results.
  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