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

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

This test checks for the presence of genetic material from the virus that causes COVID-19 in a sample taken from your respiratory tract, such as nasal or throat swab.

Quick summary

["Helps determine if you have an active COVID-19 infection."]

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

Key facts at a glance

LOINC
94532-9
Short code
SARS-rel CoV+MERS RNA Resp Ql NAA+probe
Synonyms
SARS-rel CoV+MERS RNA Resp Ql NAA+probe
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
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 molecular method to detect the virus’s genetic material (RNA) in your sample. A probe is designed to bind specifically to sequences unique to SARS-CoV-2, triggering a signal if the virus is present. This process is highly sensitive and specific, allowing for early detection of infection.

What to Expect Before the Test

You may receive instructions to avoid certain medications (like some antibiotics) or to refrain from eating or drinking for a short time before testing, depending on your lab’s protocol. Bring any recent medications or allergies to discuss with your healthcare provider.

What to Expect During the Test

A healthcare provider will collect a sample from your nose or throat using a swab. You may experience mild discomfort, but it typically takes only a few seconds. The sample is then sent to the lab for analysis.

What to Expect After the Test

Results are usually available within 24 to 48 hours. If you receive a positive result, follow your healthcare provider’s guidance for next steps, such as isolation or further testing. A negative result means the virus was not detected in this sample, but reinfection is possible.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

COVID-19 RT-PCR 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 (such as fever, cough, or shortness of breath), have been exposed to someone with COVID-19, or are required to test as part of travel, workplace, or community guidelines. It helps confirm or rule out an active infection to guide treatment and prevent spread.
What does a positive result mean?
A positive result indicates that the virus responsible for COVID-19 was detected in your sample. This means you likely have an active infection and should follow isolation precautions and seek medical advice for further management.
What does a negative result mean?
A negative result means the virus was not detected in this sample, but it does not guarantee you are not infected. COVID-19 can be contagious before symptoms appear, and testing may miss the virus if taken too early. You may need to retest if symptoms develop or exposure is suspected.
  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