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Herpes Simplex Virus Type 1 Immunoglobulin G (IgG) Antibody, Serum

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

This test measures the level of antibodies in your blood that your immune system produces in response to the herpes simplex virus type 1 (HSV-1), which can cause cold sores and other infections.

Quick summary

["It helps assess past exposure to HSV-1 and long-term immunity status."]

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

Key facts at a glance

LOINC
32831-0
Short code
HSV1 IgG 1:2 Ser IA-Rto
Synonyms
HSV1 IgG 1:2 Ser IA-Rto
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ia
CPT
82784
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

Doctors may order this test if you have symptoms like cold sores, recurrent mouth ulcers, or if you’ve had contact with someone with HSV-1. It can also be used to confirm past infection or evaluate immune response in certain medical conditions.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, typically drawn from a vein in your arm. The test is usually done in a lab setting and results are ready within a few days.

How the Test Works

The test uses an immunoassay method to detect IgG antibodies specific to HSV-1. These antibodies indicate your body has been exposed to the virus at some point, even if you don’t currently have active symptoms.

What the Results Mean

A positive result means your immune system has produced antibodies against HSV-1, suggesting past infection. A negative result means no detectable antibodies were found, indicating either no prior exposure or insufficient time since exposure for antibodies to develop.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test is primarily useful for diagnosing past infection rather than active disease. It can help guide treatment decisions, monitor immune function, or assess risk in certain clinical scenarios, such as pregnancy or immunocompromised states.

Short name

IgG Antibody to HSV-1

Frequently asked questions

What does a positive result mean for my health?
A positive result means your body has been exposed to HSV-1 at some point, but it does not necessarily mean you have an active infection. You may still be at risk for outbreaks if symptoms return. Your doctor may recommend managing symptoms or preventive measures if needed.
Can this test detect if I currently have an active HSV-1 infection?
No, this test specifically measures antibodies, which indicate past exposure. To diagnose an active infection, your doctor may use different tests, such as viral culture or PCR, which look for the virus itself in your body fluids.
How long after exposure might I develop detectable antibodies?
Antibodies typically develop within weeks to months after initial exposure. Some people may take longer to develop detectable levels, so results can vary. Your doctor will interpret the results in the context of your medical history and symptoms.
  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