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Herpes Simplex Virus (HSV) Polymerase Chain Reaction (PCR) Test, Plasma

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

This test detects the presence of genetic material from the herpes simplex virus (HSV) in your plasma. It helps determine if you have an active HSV infection, which can cause conditions like cold sores or genital herpes.

Quick summary

["This test checks for active herpes virus in your blood, aiding in diagnosis and treatment planning."]

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

Key facts at a glance

LOINC
35426-6
Short code
HSV Plr Cult
Synonyms
HSV Plr Cult
Category
chemistry
Sample
fluid
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
organism-specific-culture
Specimen volume
2-5 mL
Stability
Room temperature: 2h, Refrigerated: 24h
Hemolysis max
300
TAT
4–24 hours
Order
routine

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms like sores, pain, or unusual discharge in the mouth, genitals, or anus. They might also order it if you have a history of HSV infection, are experiencing recurrent outbreaks, or if you’re at higher risk due to certain conditions (e.g., weakened immune system).

How the Test Works

The test uses a small sample of your plasma to identify the virus’s genetic material (DNA) through PCR. This method is highly sensitive and can detect even very small amounts of the virus, helping confirm an active infection rather than past exposure.

Sample Collection and Preparation

A blood sample is drawn from a vein, typically in your arm. The plasma portion of the blood is separated and sent to a lab for testing. No special preparation is needed, but fasting may not be required unless specified by your provider.

What to Expect During and After the Test

You may feel slight discomfort or bruising at the injection site, but most people tolerate blood draws well. Afterward, you can resume normal activities. If you experience excessive bleeding or pain, contact your provider.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test is critical for diagnosing active HSV infections, guiding treatment decisions, and monitoring response to therapy. It helps differentiate between active outbreaks and latent (dormant) infections, ensuring targeted care to manage symptoms and reduce transmission risk.

Short name

HSV PCR (Plasma)

Frequently asked questions

What does a positive result mean?
A positive result indicates that the virus’s genetic material is present in your plasma, suggesting an active HSV infection. This means you may have symptoms like sores or flu-like symptoms and could be contagious.
What does a negative result mean?
A negative result means the test did not detect the virus’s genetic material in your plasma at the time of testing. However, HSV can be dormant, so you might still carry the virus without symptoms. Follow-up testing may be needed if you suspect an infection.
How often should I get this test?
Your healthcare provider will determine the frequency based on your symptoms, medical history, and risk factors. If you have frequent outbreaks or a weakened immune system, they may recommend more frequent testing.
  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