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Herpes Simplex Virus Type 1 Antibody, Fluid (Qualitative) – IgG

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

This test detects antibodies to the herpes simplex virus type 1 (HSV-1) in your body fluids, helping identify past or current infection.

Quick summary

["This test helps determine if you’ve ever been exposed to HSV-1, a common virus that can cause cold sores and other symptoms."]

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

Key facts at a glance

LOINC
29237-5
Short code
HSV1 Ab Fld-aCnc
Synonyms
HSV1 Ab Fld-aCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 like cold sores, recurrent mouth ulcers, or if you’ve been exposed to someone with HSV-1. It can also be used to confirm past infection or assess immune response in certain medical conditions.

What to Expect Before the Test

No special preparation is needed. A blood sample is typically drawn from a vein in your arm. If testing fluid from a lesion, a swab may be used instead.

What the Results Mean

Positive results indicate the presence of HSV-1 antibodies, suggesting past infection. Negative results mean no detectable antibodies were found at this time. Results alone do not confirm active infection; clinical symptoms and medical history are also considered.

Possible Side Effects

Minor side effects like slight bruising, swelling, or discomfort at the injection site may occur. Most are short-lived.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Understanding Your Results

Short name

HSV-1 Antibody (IgG) – Serology

Frequently asked questions

What does a positive result mean?
A positive result means your body has produced antibodies against HSV-1, indicating you’ve likely been exposed to the virus at some point. This does not necessarily mean you have an active infection, but it confirms past exposure. It can be useful in diagnosing recurrent infections or assessing immune function in certain cases.
Can this test detect active HSV-1 infection?
No, this test specifically measures antibodies (IgG) and cannot directly detect active infection. For diagnosing active herpes, your healthcare provider may use other tests or clinical evaluation.
How long do HSV-1 antibodies last?
HSV-1 antibodies can remain in your system for years after initial infection, though their levels may fluctuate. They do not provide lifelong immunity, and reinfection is possible.
  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