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Herpes Simplex Virus Type 1 Immunoglobulin G Antibody (Serum) – 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 and other infections. Antibodies indicate past exposure or immunity.

Quick summary

["This test helps assess past infection with HSV-1 and potential immunity status."]

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

Key facts at a glance

LOINC
16950-8
Short code
HSV1 IgG sp2 Ser-aCnc
Synonyms
HSV1 IgG sp2 Ser-aCnc
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

Why This Test Is Done

Doctors may order this test if you have symptoms of HSV-1 infection, such as cold sores, recurrent mouth ulcers, or if you’ve been exposed to someone with the virus. It can also be used to confirm past infection in individuals with no current symptoms.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample from a vein, usually in a clinic or lab. The process is quick and typically painless, though you may feel a slight pinch. Avoid alcohol for 24 hours before the test if possible.

What the Results Mean

A positive result means your body has produced antibodies against HSV-1, suggesting past infection. The exact amount (titer) can help determine if immunity is strong or if further testing is needed. A negative result means no detectable antibodies, indicating no prior exposure or immunity.

Common Causes of Abnormal Results

A high antibody level is expected if you’ve had HSV-1 before. A very low or absent level may mean you’ve never been exposed or the test was taken too soon after infection. False positives or negatives are rare but possible.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

HSV-1 IgG Antibody Level

Frequently asked questions

What does a high HSV-1 IgG antibody level mean?
A high level indicates past exposure to HSV-1, which may provide some protection against future infections. However, HSV-1 can still reactivate later in life, causing outbreaks. This test alone doesn’t predict future risk or severity of symptoms.
Why might my doctor order this test?
Your doctor may order this test to diagnose past infection, assess immunity, or evaluate exposure risk—especially in high-risk groups like healthcare workers, pregnant individuals, or those with frequent cold sores. It’s not used to diagnose active infection (which would require a different test).
Can this test be used to treat HSV-1?
No, this test only detects antibodies and doesn’t treat HSV-1. If you suspect an active infection, your doctor may recommend antiviral medications or other tests to guide treatment.
  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