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Genetic sequencing of viral RNA from respiratory specimen (e.g., nasopharyngeal swab)

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

This test analyzes the genetic material of a respiratory virus to identify its specific type and potential mutations. It helps determine if your symptoms are caused by a known virus and may guide treatment or infection control decisions.

Quick summary

["This test helps pinpoint the exact virus causing your respiratory illness and supports tailored medical advice."]

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

Key facts at a glance

LOINC
93763-1
Short code
FLUAV NS1 gene Islt-Seq
Synonyms
FLUAV NS1 gene Islt-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

Why This Test Is Done

Your healthcare provider may order this test if you have symptoms like cough, fever, or shortness of breath that suggest a viral infection. It’s particularly useful for identifying less common or emerging viruses that standard tests might miss.

How the Test Works

A swab is taken from your nose or throat to collect a sample of respiratory secretions. The sample is then processed to extract viral RNA, which is sequenced to create a detailed genetic profile of the virus.

What to Expect Before the Test

No special preparation is needed. You may feel slight discomfort from the swab, but it’s quick and typically done in a doctor’s office or clinic.

What to Expect During the Test

The swab is inserted gently into your nose or throat, and you may be asked to breathe through your mouth to avoid irritation. The sample is then sent to a lab for analysis.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Viral Genome Sequencing (Respiratory)

Frequently asked questions

How long does it take to get results?
Results can vary widely depending on the lab’s processing speed and the complexity of the virus. Some labs report results within 24–48 hours, while others may take up to a few days or longer for detailed analysis.
What does a positive result mean?
A positive result confirms the presence of a specific respiratory virus in your sample. This helps your healthcare provider confirm the diagnosis, rule out other causes of your symptoms, and tailor treatment or recommendations accordingly.
Can this test detect all viruses?
No, this test focuses on viral RNA and may not detect all possible respiratory infections. It’s best used alongside other diagnostic tests if needed, especially for less common or atypical viruses.
  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