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Herpes Simplex Virus Type 1 Antibody, IgG (Quantitative)

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

This test measures the amount of antibodies your body produces in response to the herpes simplex virus type 1 (HSV-1), which can cause cold sores or other infections.

Quick summary

["It helps determine if you’ve been exposed to HSV-1 and whether your immune system has developed immunity."]

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

Key facts at a glance

LOINC
48400-6
Short code
HSV1+2 Ag Tiss Ql IF
Synonyms
HSV1+2 Ag Tiss 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
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 to check for past exposure to HSV-1, especially if you have symptoms like cold sores, recurrent mouth ulcers, or if you’re at higher risk due to immune conditions or sexual history. It can also be used in research or for monitoring immune response in certain clinical settings.

What to Expect Before the Test

No special preparation is needed. You’ll likely have a blood sample drawn from a vein in your arm, similar to other blood tests. If you’re concerned about discomfort, let your healthcare provider know.

What the Test Results Mean

A positive result means you have detectable HSV-1 antibodies, indicating past exposure and likely immunity. A negative result suggests no current detectable antibodies, meaning you may not have been exposed recently or your immune system hasn’t mounted a response yet.

Common Reasons for Testing

This test is often used in research studies, epidemiological studies, or to assess immune status in individuals with weakened immune systems. It’s not typically used for diagnosing active HSV-1 infections, as those are usually managed with viral culture or PCR testing.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

While HSV-1 antibodies indicate past exposure and immunity, they don’t provide information about current infection status. This test is valuable for understanding exposure history, especially in populations where HSV-1 is common, such as children or individuals in certain healthcare or research settings. It can also help guide preventive measures or research studies.

Short name

IgG HSV-1 Antibody

Frequently asked questions

What does a positive result mean?
A positive result means your body has produced antibodies against HSV-1, suggesting you’ve likely been exposed to the virus at some point. This doesn’t mean you’re currently infected or that you’ll always have symptoms. It simply indicates your immune system has recognized and responded to the virus.
Can this test detect active herpes infections?
No, this test specifically measures antibodies, which are part of your immune response to past exposure. For diagnosing active herpes infections, other tests like viral culture or PCR are used to detect the virus itself.
Is there any risk or discomfort with this test?
The most common discomfort is a slight pinch when the needle is inserted. Most people feel minimal pain or bruising afterward. If you have a blood disorder or are on blood thinners, let your healthcare provider know before the test.
  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