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SARS-CoV-2 Nucleic Acid Detection in Respiratory Specimen by Probe-Based Molecular Assay

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

This test checks for the genetic material of SARS-CoV-2, the virus responsible for COVID-19, in a sample taken from your respiratory tract. It helps determine if you currently have an active infection.

Quick summary

["Determines whether you may have an active COVID-19 infection."]

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

Key facts at a glance

LOINC
76596-6
Short code
S pyogenes csrS XXX.tiss NAA+probe
Synonyms
S pyogenes csrS XXX.tiss NAA+probe
Category
coagulation
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
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 specialized molecular method to detect the virus’s genetic material (nucleic acids) in your sample. A probe is designed to bind specifically to sequences unique to SARS-CoV-2, triggering a measurable signal if the virus is present. This process is highly sensitive and can identify even small amounts of viral material.

Sample Collection

You’ll provide a nasal or throat swab sample, often collected by a healthcare provider. The sample is then processed in a laboratory to extract viral genetic material for testing.

What to Expect Before the Test

No special preparation is needed, but you may be asked to avoid certain medications or procedures that could affect results. If you’re symptomatic, inform your provider—this test is most reliable when taken early in an infection.

What to Expect After the Test

Results are typically available within 24–48 hours. If positive, you may need isolation or additional care. If negative but you’re symptomatic, repeat testing may be recommended.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test is critical for diagnosing active COVID-19, guiding treatment decisions, and controlling outbreaks. It helps identify individuals who may spread the virus to others, even if they’re asymptomatic. Results inform public health measures and personal safety protocols.

Short name

COVID-19 Nucleic Acid Test

Frequently asked questions

Why might my test result be positive even if I don’t feel sick?
You could be asymptomatic or pre-symptomatic, meaning you may have been exposed but haven’t yet developed symptoms. Some people test positive without realizing they’re infected. This test is designed to detect the virus’s genetic material, not symptoms.
What if I get a negative result but I still feel unwell?
A negative result means the test did not detect the virus’s genetic material at the time of testing. If you’re still unwell, you may need to retest or consider other causes for your symptoms. Consult your healthcare provider for further evaluation.
Can this test detect variants of the virus?
This test detects the general genetic material of SARS-CoV-2 but may not distinguish between specific variants. Some testing platforms are updated to include variant-specific probes, but results should be interpreted by a healthcare provider familiar with your clinical context.
  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