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SARS-CoV-2 Nucleic Acid Test (Qualitative, Specimen: Saliva)

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

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

Quick summary

["A COVID-19 test to detect the virus in your saliva, often used for screening or confirmation of infection."]

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

Key facts at a glance

LOINC
94312-6
Short code
SARS-CoV-2 N gene Ct Spec Qn NAA N2
Synonyms
SARS-CoV-2 N gene Ct Spec Qn NAA N2
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
probe-amp-tar-cdc-primer-probe-set-n
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 collects a sample of saliva and analyzes it for the virus’s genetic material (RNA). If the virus is present, the test will detect it. This method is highly sensitive and used to confirm COVID-19 infection, even when symptoms are mild or absent.

When You Might Need This Test

Your healthcare provider may recommend this test if you have symptoms of COVID-19 (e.g., fever, cough, fatigue), have been exposed to someone with COVID-19, or as part of routine screening in certain settings (e.g., pre-travel, workplace, or community testing). It can also be used for confirmation after a positive antigen test.

Test Preparation

No special preparation is needed. You may spit into a provided container, or a healthcare provider may collect a saliva sample directly. Avoid eating, drinking, or brushing your teeth for 30 minutes before testing to ensure accuracy.

What to Expect After the Test

Results are typically available within 24 to 72 hours, depending on the lab’s processing time. You’ll receive a written report with your results. If you test positive, follow your healthcare provider’s guidance for isolation and treatment.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

SARS-CoV-2 RNA Detection (Saliva)

Frequently asked questions

Why is this test important?
This test is critical for identifying active COVID-19 infections. It helps prevent the spread of the virus by allowing early detection, isolation of infected individuals, and targeted public health measures. A positive result means you may be contagious and should take precautions to avoid infecting others.
What does a positive result mean?
A positive result indicates that the virus’s genetic material was detected in your saliva, suggesting you have an active COVID-19 infection. You should isolate yourself from others, follow CDC guidelines for treatment, and monitor for worsening symptoms. A repeat test may be recommended if symptoms persist.
Can this test detect the virus even if I feel fine?
Yes, this test can detect COVID-19 even if you don’t have symptoms. Some people are asymptomatic carriers and may still spread the virus. If you’ve been exposed or are in a high-risk setting, this test can help confirm infection before symptoms develop.
  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