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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. Antibodies are proteins your immune system makes to help fight infections.

Quick summary

["This test helps assess past exposure to HSV-1, which can cause cold sores or oral herpes."]

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

Key facts at a glance

LOINC
40466-5
Short code
HSV1 IgM Ser Ql IF
Synonyms
HSV1 IgM Ser Ql 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

Why This Test Is Done

Your healthcare provider may order this test if you have symptoms of herpes (e.g., sores, pain, or flu-like symptoms) or if you have a history of HSV-1. It can also be used to confirm past infection when symptoms are unclear or to monitor immune response in certain conditions.

What to Expect Before the Test

No special preparation is needed. You’ll have a small needle inserted into your arm to draw blood. The process usually takes a few minutes. If you’re nervous, let your provider know—they can offer ways to make it more comfortable.

What the Test Results Mean

A positive result means your body has produced antibodies against HSV-1, indicating past infection. A negative result suggests no detectable antibodies, meaning either you’ve never been exposed or the test was taken too soon after exposure. Results don’t confirm active infection—other tests may be needed for that.

Common Causes of Abnormal Results

False negatives can occur if tested too early after exposure. False positives are rare but may happen if you have other infections or autoimmune conditions. If results are unclear, your provider may repeat the test or order additional tests.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

HSV-1 IgG Antibody

Frequently asked questions

Can I get this test if I’m pregnant?
Yes, this test can be done during pregnancy to assess potential exposure to HSV-1, though it doesn’t replace other prenatal testing. Always discuss results with your healthcare provider.
What if my test shows past exposure but I don’t have symptoms?
Having past exposure doesn’t mean you’ll always have symptoms. HSV-1 can lie dormant in your body and reactivate later. Your provider may recommend monitoring or treatment if symptoms recur.
Does this test help with treatment decisions?
While this test confirms past exposure, it doesn’t guide treatment for active herpes. If you have symptoms, your provider may recommend antiviral medications to manage outbreaks.
  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