Skip to content

SARS-CoV-2 RNA Detection by Nasal Pharyngeal Sequencing

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

This test checks for genetic material from the SARS-CoV-2 virus in a sample taken from your nasal passage. It helps determine if you may have been exposed to the virus, even if you don’t yet have symptoms.

Quick summary

["This test helps identify potential COVID-19 infection early, supporting timely medical guidance and treatment options."]

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

Key facts at a glance

LOINC
94822-4
Short code
SARS-CoV-2 RNA Sal Ql Seq
Synonyms
SARS-CoV-2 RNA Sal Ql Seq
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
sequencing
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

A healthcare provider collects a sample from your nasal passage using a swab. The swab is then sent to a lab for analysis. The lab uses advanced sequencing technology to detect the genetic material (RNA) of SARS-CoV-2, which is unique to the virus. If the virus is present, the test can confirm exposure.

What to Expect Before the Test

You may experience mild discomfort or irritation during the swab collection, but it typically takes only a few seconds. No special preparation is needed, though you should avoid smoking or using nasal sprays 15–30 minutes before the test.

What to Expect After the Test

Most people experience no lasting effects after the test. If you feel discomfort, it may subside quickly. Avoid blowing your nose vigorously immediately afterward to prevent sample contamination.

When This Test Is Used

This test is commonly used for screening, monitoring, or confirming exposure to SARS-CoV-2 in individuals suspected of COVID-19 infection, asymptomatic carriers, or those in high-risk settings (e.g., healthcare, travel, or outbreaks).

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Nasal Swab SARS-CoV-2 RNA Test

Frequently asked questions

How long does it take to get results?
Results are typically available within 24–72 hours, depending on lab processing times. Follow-up with your healthcare provider if you have questions about your results.
Can I get this test at home?
Some at-home tests exist for SARS-CoV-2 RNA detection, but they may have different accuracy, availability, or regulatory approvals. Always use FDA-cleared or authorized tests and consult a healthcare provider for guidance.
Does this test detect past infection?
No, this test detects viral RNA only during active infection. For evidence of past infection, serology tests (e.g., antibody tests) may be used to identify immune response from prior exposure.
  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