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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 against herpes simplex virus type 1 (HSV-1) in your blood. These antibodies indicate past exposure to the virus, which can cause cold sores or other infections.

Quick summary

["Past exposure to HSV-1 is detected through antibody testing, not active infection."]

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

Key facts at a glance

LOINC
50758-2
Short code
HSV1 IgM Titr Ser IF
Synonyms
HSV1 IgM Titr Ser IF
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
if
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?

Herpes simplex virus type 1 (HSV-1) is a common virus that can cause cold sores around the mouth and, in rare cases, more severe infections. This test specifically looks for IgG antibodies, which develop after your body has encountered the virus. IgG antibodies are a sign that your immune system has recognized and fought off the virus in the past.

Why Might You Need This Test?

Doctors may order this test if you have a history of cold sores, recurrent oral lesions, or if you suspect past exposure to HSV-1. It can also be used in research or certain diagnostic contexts where understanding past infection is important.

How Is the Test Performed?

A blood sample is taken from a vein in your arm. The sample is then sent to a lab for analysis using an immunoassay method to detect the presence of HSV-1 IgG antibodies.

What Are the Results Typically Used For?

Results help confirm past exposure to HSV-1, which can be useful for understanding infection history, especially in research or specific clinical scenarios. It does not diagnose current infection or active disease.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

HSV-1 IgG Antibody

Frequently asked questions

How long after exposure can antibodies be detected?
IgG antibodies against HSV-1 typically begin appearing within weeks to months after initial infection. They can remain detectable in the blood for a long time, often for life, as they provide long-term immunity.
Can this test differentiate between HSV-1 and HSV-2?
No, this test specifically measures HSV-1 IgG antibodies. To distinguish between HSV-1 and HSV-2, a separate test for HSV-2 antibodies would be required.
What if my test results are positive?
A positive result indicates past exposure to HSV-1. You may have had cold sores or another infection caused by the virus. This does not mean you are currently infected or at risk of active disease. If you have symptoms, consult your healthcare provider for further evaluation.
  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