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Viral DNA Detection in Nasopharyngeal Specimen (Qualitative)

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

This test checks for the presence of viral genetic material in your nasal or throat swab, often used to diagnose respiratory infections like colds, flu, or COVID-19.

Quick summary

["This test helps identify if a virus is causing symptoms in your upper respiratory tract."]

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

Key facts at a glance

LOINC
53774-6
Short code
EBV DNA Spec NAA+probe-Log#
Synonyms
EBV DNA Spec NAA+probe-Log#
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

A swab is taken from your nose or throat to collect a sample. The lab then analyzes this sample to detect viral DNA using advanced molecular techniques, such as polymerase chain reaction (PCR).

What to Expect Before the Test

You may need to avoid certain medications (like some antibiotics) before the test, depending on your doctor’s instructions. You can eat and drink normally, but avoid smoking or using nasal sprays for a few hours before the procedure.

Common Uses

This test is commonly used to diagnose respiratory infections, including viral illnesses like influenza, respiratory syncytial virus (RSV), adenovirus, or COVID-19. It can also help confirm or rule out other possible causes of symptoms like coughing, fever, or sore throat.

What the Results Mean

A positive result means the test detected viral DNA in your sample, suggesting you may have an active viral infection. A negative result means no viral DNA was found, but this does not always rule out infection if the test was not done early enough or if the virus is still present in low amounts.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Frequently asked questions

Why might my doctor order this test?
Your doctor may recommend this test if you have symptoms like a fever, cough, sore throat, or difficulty breathing, especially if you’ve been exposed to a known virus. It helps guide treatment decisions, such as isolating you from others or prescribing antiviral medications.
What if my results are positive?
A positive result means you likely have an active viral infection. Follow your doctor’s advice for isolation, treatment, and monitoring. Some viruses may require specific medications or supportive care, such as rest and fluids.
How soon will I get my results?
Results are typically available within 24 to 72 hours, depending on lab processing times. Your doctor will contact you with the results, and they may discuss next steps, such as further testing or treatment options.
  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