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Herpes Simplex Virus Type 1 Immunoglobulin G Antibody (Serum)

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

This test measures the presence of antibodies against Herpes Simplex Virus Type 1 (HSV-1) in your blood. These antibodies indicate whether your immune system has encountered HSV-1 before.

Quick summary

["This test helps determine past exposure to HSV-1, which can affect understanding of infection risk or history."]

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

Key facts at a glance

LOINC
16949-0
Short code
HSV1 IgG sp1 Ser-aCnc
Synonyms
HSV1 IgG sp1 Ser-aCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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, a type of antibody your immune system produces in response to past infection. These antibodies do not directly indicate whether you currently have an active HSV-1 infection but suggest you were previously exposed.

Why Might You Need This Test?

Your healthcare provider may order this test if you have symptoms or history suggestive of past HSV-1 exposure, such as recurrent cold sores, or if you’re evaluating immune response in certain conditions.

How Is the Test Performed?

A blood sample is drawn from a vein in your arm. The serum portion is tested for HSV-1 IgG antibodies using an immunoassay method to detect these antibodies.

What Do Results Mean?

Positive results indicate prior exposure to HSV-1, meaning your body has likely produced antibodies to fight the virus. Negative results suggest no detectable antibodies, meaning either you’ve never been exposed or the test was taken too soon after exposure.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Understanding HSV-1 Antibody Status

Short name

HSV-1 IgG Antibody

Frequently asked questions

What are the typical reference ranges for this test?
Reference ranges vary by lab and method. A positive result (typically ≥ index threshold) means past exposure; a negative result means no detectable antibodies at the time of testing. This does not confirm current infection status.
Can this test tell me if I currently have HSV-1?
No, this test only shows if you’ve had past exposure to HSV-1. For active infection, your provider may recommend additional testing, such as HSV-1 PCR or viral culture.
How long after exposure might I test positive?
IgG antibodies typically develop within weeks to months after initial HSV-1 exposure. Testing too soon after exposure may yield negative results despite past 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