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Herpes Simplex Virus 1 Immunoglobulin G Antibody (Serum)

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

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

Quick summary

["This test helps determine if you’ve been exposed to HSV-1 and whether your immune system has developed protection against it."]

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

Key facts at a glance

LOINC
58786-5
Short code
HSV1 IgG CSF IA-aCnc
Synonyms
HSV1 IgG CSF IA-aCnc
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ia
CPT
82784
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
TAT
4–24 hours
Order
routine

Why This Test Is Done

Your healthcare provider may order this test if you have symptoms like cold sores, recurrent oral lesions, or if you’ve been exposed to someone with HSV-1. It can also be used to screen for past infection in individuals with no current symptoms.

What to Expect Before the Test

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

What the Test Results Mean

Positive results indicate you’ve likely had exposure to HSV-1 and developed antibodies to fight it. Negative results mean you either haven’t been exposed or your body hasn’t produced detectable antibodies yet.

Common Reasons for Testing

This test is often used to confirm past infection rather than diagnose current active infection, which is usually managed with viral culture or PCR testing.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

HSV-1 IgG antibodies provide long-term immunity after infection. While they don’t indicate active disease, they confirm past exposure. This can be important for understanding infection history, especially in healthcare settings or for individuals with weakened immune systems.

Short name

HSV-1 IgG Antibody

Frequently asked questions

What does a positive result mean?
A positive result means your body has produced antibodies against HSV-1, suggesting you’ve been infected at some point. This doesn’t mean you’re currently sick, but it confirms past exposure.
Can this test detect active herpes outbreaks?
No, this test only measures antibodies, which indicate past infection. Active herpes outbreaks are diagnosed with different tests, such as viral culture or PCR.
How long after exposure might I get positive results?
Results typically appear within 2–3 weeks after exposure, but can take longer in some cases. Antibody levels may remain detectable for years after infection.
  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