Skip to content

Herpes Simplex Virus Type 1 (HSV-1) IgG Antibody, Serum

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

This test measures the presence of antibodies against the herpes simplex virus type 1 (HSV-1) in your blood. These antibodies indicate whether your immune system has ever been exposed to HSV-1.

Quick summary

["This test helps determine past exposure to HSV-1, which can inform understanding of infection history or potential risk for future outbreaks."]

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

Key facts at a glance

LOINC
90461-5
Short code
HSV1+2 IgG Ser Ql IA
Synonyms
HSV1+2 IgG Ser Ql IA
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

What Does This Test Measure?

The test detects IgG antibodies specific to HSV-1, which develop after an initial infection or vaccination. These antibodies remain in your blood for years, providing a record of past exposure rather than active infection.

Why Might You Need This Test?

A HSV-1 IgG antibody test is often used when evaluating symptoms like cold sores, fever blisters, or when assessing risk for HSV-1 transmission. It may also be part of a broader evaluation for recurrent oral herpes or in certain medical research contexts.

How Is the Test Performed?

A blood sample is drawn from a vein in your arm. The sample is sent to a lab where it is tested using an immunoassay method to identify HSV-1 specific antibodies.

What Are the Possible Results?

Results are typically reported as positive or negative. A positive result means your body has produced antibodies against HSV-1, suggesting past exposure. A negative result indicates no detectable antibodies, meaning 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.

◆Associated findings1

Short name

HSV-1 IgG Antibody

Frequently asked questions

What does a positive result mean?
A positive result means your immune system has likely been exposed to HSV-1 at some point in the past. This does not mean you currently have an active infection, but it confirms you have developed antibodies to the virus.
Can this test detect an active herpes infection?
No, this test specifically looks for antibodies, which indicate past exposure rather than an active infection. For diagnosing active herpes, your healthcare provider may recommend other tests or clinical evaluation.
How long after exposure might it take for this test to show positive?
Antibodies typically develop within weeks to months after initial HSV-1 exposure. However, the exact timing can vary. If you suspect recent exposure, discuss this with your healthcare provider for guidance on timing.
  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