Skip to content

Throat Swab Viral Detection by Nucleic Acid Amplification (e.g., PCR)

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

This test checks for viruses in saliva collected from your throat using a swab. It helps identify infections like colds, flu, or other respiratory viruses.

Quick summary

["Detects common respiratory viruses quickly to guide treatment or isolation decisions."]

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

Key facts at a glance

LOINC
91873-0
Short code
C trach Ag Throat Ql IF
Synonyms
C trach Ag Throat Ql IF
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
if
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 by swabbing your throat. The swab is then sent to a lab where viral genetic material is extracted and amplified using a highly sensitive technique. Results identify specific viruses if present.

What to Expect Before the Test

No special preparation is needed. You may have mild discomfort from the swab, but it typically takes less than a minute. Avoid eating, drinking, or smoking for 30 minutes before testing if instructed.

Common Causes for Testing

Your doctor may recommend this test if you have symptoms like sore throat, cough, fever, or if you’ve been exposed to someone with a contagious respiratory illness.

Possible Results and Next Steps

A positive result confirms a viral infection. A negative result means no detectable virus was found at the time of testing, but you may still have symptoms from another cause.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test is critical for public health by identifying contagious viruses early. It helps prevent spread in schools, workplaces, or communities by guiding isolation and treatment recommendations.

Short name

Viral throat swab PCR test

Frequently asked questions

Why might my test results be delayed?
Delays can occur due to lab backlogs, specimen handling, or processing times. Follow-up with your provider if you need results sooner.
Can I get false positives or false negatives?
False positives are rare with PCR testing, but false negatives can happen if the virus is not actively replicating at the time of testing or if the sample was improperly collected.
What if I test positive for a virus?
If positive, follow your healthcare provider’s advice for isolation, rest, and symptom management. Some viruses may require antiviral medications or monitoring.
  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