Skip to content

Herpes Simplex Virus Type 1 Immunoglobulin G (IgG) Antibody

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). These antibodies help your body recognize and fight the virus if it becomes active.

Quick summary

["This test helps determine if you’ve ever been exposed to HSV-1, even if you don’t currently have symptoms."]

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

Key facts at a glance

LOINC
33291-6
Short code
HSV1 IgG Ser Ql IB
Synonyms
HSV1 IgG Ser Ql IB
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ib
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 a history of cold sores (fever blisters), recurrent mouth sores, 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 active symptoms.

What to Expect During the Test

A small amount of blood is drawn from a vein in your arm. You may feel a slight pinch, but it usually doesn’t cause significant discomfort. The test is quick and typically done in a doctor’s office or lab.

What the Results Mean

If your test result is positive for HSV-1 IgG antibodies, it means your immune system has likely encountered the virus at some point, even if symptoms were never present. This does not indicate whether the virus is currently active or causing infection.

Common Causes of Positive Results

A positive result is common in people who have had cold sores, oral herpes, or other HSV-1-related infections in the past. It can also occur in individuals who have been exposed to the virus but haven’t developed symptoms yet.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

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 produced antibodies against HSV-1, indicating past exposure. This does not mean you currently have an active infection, but it does mean you may be at risk of reactivation if your immune system is compromised.
Can this test tell me if I have an active herpes infection right now?
No, this test only detects antibodies from past exposure. If you have active symptoms like sores or blisters, your doctor may order additional tests to check for active herpes infection.
How long does it take to get the results of this test?
Results are usually available within 1 to 3 business days, depending on your lab and healthcare provider’s processing times.
  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