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Herpes Simplex Virus Type 1 (HSV-1) Antibody Test by Immunoassay (Serum/Plasma)

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

This test measures antibodies to Herpes Simplex Virus Type 1 (HSV-1) in your blood. Antibodies are proteins your immune system produces in response to exposure to the virus.

Quick summary

["This test helps determine if you’ve been exposed to HSV-1, which can cause cold sores or other infections."]

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

Key facts at a glance

LOINC
33292-4
Short code
HSV1+2 Ab Titr CSF IF
Synonyms
HSV1+2 Ab Titr CSF IF
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
if
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
TAT
4–24 hours
Order
routine

What Does This Test Measure?

The test detects specific antibodies (immunoglobulins) your body creates after exposure to HSV-1. These antibodies are part of your immune response and can indicate past infection, even if you don’t currently have symptoms.

Why Might You Need This Test?

Your healthcare provider may recommend this test if you have symptoms like cold sores, recurrent mouth ulcers, or if you’ve had close contact with someone known to have HSV-1. It can also be used in research or screening contexts.

How Is the Sample Collected?

A small amount of blood is drawn from a vein in your arm. The blood is then processed into either serum (liquid part after clotting) or plasma (liquid part after centrifugation).

What Are Possible Results?

Results are qualitative (positive or negative) and indicate whether antibodies to HSV-1 were detected. A positive result suggests past exposure, but it does not confirm active infection without additional testing.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

HSV-1 Antibody

Frequently asked questions

What does a positive result mean?
A positive result means your body has produced antibodies against HSV-1, indicating past exposure. This does not necessarily mean you are currently infected or contagious, but it confirms your immune system has encountered the virus.
Can this test tell me if I have an active HSV-1 infection?
No, this antibody test alone cannot confirm an active infection. If you suspect an active infection (e.g., frequent cold sores), your doctor may recommend additional tests, such as viral culture or PCR testing.
How long after exposure might I get a positive result?
Antibody levels develop gradually after exposure. You may not test positive immediately, and results can vary. Some people develop antibodies within weeks to months after initial exposure, while others may take longer.
  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