Skip to content

SARS-CoV-2 Nucleic Acid Test (Saliva) – Qualitative

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

This test detects genetic material from the virus that causes COVID-19 in your saliva. It helps determine if you currently have an active infection.

Quick summary

["A simple saliva sample can quickly check for COVID-19 infection."]

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

Key facts at a glance

LOINC
109239-4
Short code
SARS-CoV-2 N gene Msmt Sal
Synonyms
SARS-CoV-2 N gene Msmt Sal
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

Your saliva sample is collected and tested for the presence of SARS-CoV-2 genetic material using a molecular method. This process identifies whether the virus is actively present in your body. The test is highly sensitive and designed to detect even small amounts of viral material.

Sample Collection

You will provide a small saliva sample using a provided collection device. This is typically done by swabbing your inner cheek or collecting saliva into a tube. No special preparation is needed, but avoid eating, drinking, or smoking for about 30 minutes before testing.

What to Expect After Testing

Results are usually available within 24 to 48 hours. If you receive a positive result, follow your healthcare provider’s guidance for next steps, which may include isolation or further testing. A negative result means the test did not detect the virus at the time of testing but does not guarantee you are no longer infected.

When This Test Is Used

This test is commonly used for screening, monitoring, or confirming COVID-19 infection in individuals who are symptomatic or asymptomatic. It is often used in settings like schools, workplaces, or community testing programs.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test plays a critical role in public health by identifying active COVID-19 infections. Early detection helps prevent the spread of the virus, supports timely treatment, and allows for better management of outbreaks in communities. It is particularly useful for monitoring high-risk populations or those exposed to the virus.

Frequently asked questions

What does a positive result mean?
A positive result indicates that the test detected genetic material from the SARS-CoV-2 virus in your saliva, suggesting you are currently infected with COVID-19. Follow your healthcare provider’s instructions for next steps, which may include isolating at home, seeking medical care, or reporting to public health authorities.
Can I get a false positive result?
While rare, false positives can occur, especially if the test is not performed correctly or if there are technical issues. If you receive a positive result, further testing may be recommended to confirm the diagnosis. False negatives are also possible if the virus is not present in detectable amounts at the time of testing.
How long does it take to get results?
Results are typically available within 24 to 48 hours, depending on the laboratory’s processing time. Some testing sites may offer same-day results, but this can vary by location and healthcare provider. Follow-up instructions will guide you on what to do next based on your 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