Herpes Simplex Virus Type 1 Immunoglobulin G Antibody (Serum/Plasma)
This test measures the presence of antibodies to 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.
["Past exposure to HSV-1 may be detected through antibody testing, even if you haven’t had symptoms recently."]
Key facts at a glance
- LOINC
- 51916-5
- Short code
- HSV1 IgG SerPl Ql IA
- Synonyms
- HSV1 IgG SerPl Ql IA
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- ia
- 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 Might Be Ordered
Your healthcare provider may recommend this test if you have concerns about past exposure to HSV-1, such as recurring cold sores, a history of oral herpes, or if you’re planning a pregnancy and need to assess potential risks. It can also be part of a broader evaluation for immune-related conditions.
What to Expect During the Test
A small blood sample will be taken from a vein, usually in your arm. You may feel a slight pinch, but it’s generally quick and not painful. The sample is then sent to a lab for analysis using an immunoassay method to detect antibodies.
What the Results Mean
If your test is positive for HSV-1 IgG antibodies, it means your body has developed immunity to HSV-1 from 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 indicate current infection status.
Common Reasons for Testing
This test is often used to confirm past infection rather than diagnose active herpes outbreaks. It’s particularly useful for individuals with recurrent cold sores, those with immune system concerns, or in certain clinical settings to assess exposure history.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Short name
HSV-1 IgG Antibody
Frequently asked questions
Positive results indicate immunity and generally do not require treatment unless there are specific clinical concerns (e.g., immune suppression). Negative results may prompt further evaluation if there’s a suspicion of recent exposure or symptoms of infection. This test does not replace diagnosis of active herpes, which would require clinical signs or other testing.
A positive result means your body has produced antibodies to HSV-1, suggesting you’ve likely had the virus in the past. This does not mean you’re currently infected or that you’ll always have symptoms. It indicates immunity, which can be reassuring if you’re concerned about exposure.
No, this test specifically measures antibodies for past exposure. Active herpes infection would require clinical symptoms (e.g., sores) or other diagnostic tests, such as viral culture or PCR testing.
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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