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Antigen Detection Test for SARS-CoV-2 (COVID-19) in Respiratory Specimen

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

This test checks for the presence of SARS-CoV-2 antigens in your respiratory secretions, such as nasal or throat swabs, to help determine if you may have an active COVID-19 infection.

Quick summary

["A quick way to detect possible COVID-19 infection using a simple nasal or throat swab test."]

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

Key facts at a glance

LOINC
94806-7
Short code
COVID-19 Intub+Consult
Synonyms
COVID-19 Intub+Consult
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 swab to collect a sample from your nose or throat. The sample is then analyzed for specific proteins (antigens) produced by the SARS-CoV-2 virus. If these proteins are found, it suggests you may have an active infection.

What to Expect During the Test

You’ll likely have a quick and painless procedure where a healthcare provider collects a swab from your upper respiratory tract. Results are often available within 15–30 minutes.

When This Test Is Used

This test is commonly used for rapid screening in healthcare settings, public health surveillance, or when immediate results are needed to guide treatment decisions, especially in high-risk or high-transmission environments.

Limitations of This Test

While useful for quick detection, this test may not detect all cases of COVID-19, especially if the virus is present in low amounts. It also may not be as reliable as PCR tests for detecting early or mild infections.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

COVID-19 Rapid Antigen Test (Respiratory)

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 (e.g., schools, workplaces, or travel). It helps guide decisions about isolation, treatment, or further testing.
What does a positive result mean?
A positive result suggests you may have an active COVID-19 infection and should follow isolation guidelines. It does not confirm the exact severity or duration of your illness, so follow-up testing or medical evaluation may be needed.
What if I get a negative result but still feel sick?
A negative result means the test did not detect the virus at the time of testing, but you could still have COVID-19 if symptoms develop later. If you continue to feel unwell, consult your healthcare provider for further evaluation, including repeat testing if needed.
  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