Skip to content

Herpes Simplex Virus Type 1 Immunoglobulin G (IgG) Antibody, Serum

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

This test measures the presence of antibodies to the herpes simplex virus type 1 (HSV-1) in your blood. Antibodies are your body’s natural defense against infections.

Quick summary

["This test helps determine if you’ve been exposed to HSV-1, which can cause cold sores or other infections."]

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

Key facts at a glance

LOINC
21326-4
Short code
HSV1 IgM Titr Ser
Synonyms
HSV1 IgM Titr Ser
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, which develop after initial infection or vaccination. These antibodies indicate past exposure to the virus, even if you don’t currently have symptoms.

Why Might You Need This Test?

Your healthcare provider may order this test if you have a history of cold sores, recurrent oral or genital sores, or if you’re being evaluated for conditions linked to HSV-1 exposure, such as certain neurological disorders.

What to Expect Before the Test

No special preparation is needed. A blood sample will be taken from a vein in your arm. You may feel a slight pinch, but it’s usually over quickly.

What Are Possible Results?

A positive result means you likely had HSV-1 at some point, but it doesn’t confirm active infection. A negative result suggests no detectable antibodies, meaning you may not have been exposed recently.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

While this test confirms past exposure to HSV-1, it doesn’t indicate whether you’re currently infected or at risk for outbreaks. Antibody levels can decline over time, so repeat testing may be needed for monitoring.

Short name

HSV-1 IgG Antibody

Frequently asked questions

Can this test show if I have an active cold sore?
No, this test only detects antibodies, not active infection. For active symptoms, your provider may recommend a different test or viral culture.
What does a high or low antibody level mean?
A high antibody level suggests past exposure, but it doesn’t indicate the severity or frequency of past infections. A low level could mean you’ve never been exposed or the test was taken too soon after exposure.
Is this test covered by insurance?
Coverage depends on your insurance and reason for testing. Check with your provider or insurance company to confirm if this test is included in your benefits.
  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