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Herpes Simplex Virus Type 1 Antibody, Serum (Qualitative Immunoassay)

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

This test checks for antibodies to the herpes simplex virus type 1 (HSV-1), a common virus that can cause cold sores and other infections.

Quick summary

["It helps determine if your body has ever been exposed to HSV-1."]

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

Key facts at a glance

LOINC
5205-0
Short code
HSV1 Ab Ser IA-aCnc
Synonyms
HSV1 Ab Ser IA-aCnc
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
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

What This Test Measures

The test detects antibodies produced by your immune system in response to past or potential exposure to HSV-1. Antibodies are proteins that help your body fight infections. This test is qualitative, meaning it only tells whether antibodies are present or not, rather than measuring their exact amount.

Why It’s Ordered

Doctors may order this test if you have symptoms like cold sores, recurrent mouth ulcers, or if you have concerns about HSV-1 exposure, such as after contact with someone who has an active cold sore.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, usually drawn from your arm. The test is quick and typically done in a lab setting.

What the Results Mean

A positive result indicates your body has made antibodies to HSV-1, suggesting past exposure. A negative result means no detectable antibodies were found at this time, but it doesn’t rule out past infection.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

HSV-1 Antibody (Serum)

Frequently asked questions

This test is primarily used for screening or confirming past exposure to HSV-1 rather than diagnosing active infections. It can help guide treatment decisions or monitor immune response in certain medical conditions.
A positive result does not indicate the severity or current activity of the infection. It’s important to discuss your results with your healthcare provider for personalized guidance.
What does a positive result mean?
A positive result means your immune system has recognized and responded to HSV-1, likely from past exposure. This does not indicate whether you currently have an active infection or the severity of any past infections.
Can I get this test if I have an active cold sore?
Yes, you can. However, a positive result does not directly relate to whether you have an active cold sore at the time of testing. This test is for detecting past exposure, not active infection.
  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