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Herpes Simplex Virus (HSV) Culture (from Nasopharyngeal Swab)

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

This test checks for the presence of the herpes simplex virus (HSV) in your nasal passages, often done to diagnose infections like cold sores or genital herpes.

Quick summary

["A culture helps confirm if HSV is causing an infection and guides treatment decisions."]

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

Key facts at a glance

LOINC
35451-4
Short code
HSV Nph Cult
Synonyms
HSV Nph Cult
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
organism-specific-culture
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

What Does This Test Measure?

The test involves collecting a sample from your nasal passages using a swab. The swab is then sent to a lab where it is grown in a controlled environment to identify HSV if present. This is not a blood test or antibody test but a direct culture to detect live virus particles.

Why Might You Need This Test?

You may need this test if you have symptoms like sores, pain, or unusual discharge in your mouth, nose, or genital area that could be caused by HSV. It’s also used to diagnose infections in newborns or people with weakened immune systems.

What to Expect Before the Test

No special preparation is needed. You may experience slight discomfort or irritation during the swab collection, but it usually takes only a few seconds. Avoid using nasal drops or sprays before the test if instructed.

What Happens During the Test?

A healthcare provider will insert a sterile swab into your nasal passages to collect a sample. The swab is gently moved around to collect cells and fluids. The sample is then sent to a lab for culture.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test is crucial for diagnosing active HSV infections. It helps determine the type of HSV (HSV-1 or HSV-2) and guides appropriate treatment, such as antiviral medications. Early diagnosis can prevent complications and reduce the risk of spreading the virus.

Short name

HSV Culture

Frequently asked questions

How long does it take to get results?
Results can take several days to a week or more, depending on the lab’s processing time. You’ll typically receive a call or letter once results are ready.
What does a positive result mean?
A positive result means the lab detected live HSV in your sample. This confirms an active infection and helps your healthcare provider tailor treatment to your needs.
Can I take antibiotics for this test?
No, antibiotics are not effective against viruses like HSV. They won’t affect the test results. If you suspect an infection, avoid using nasal drops or sprays unless instructed by your doctor.
  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