Listeria monocytogenes Antibody Detection by Immunoassay (Serum/Plasma)
This test checks for antibodies to *Listeria monocytogenes*, a bacteria that can cause serious infections, especially in pregnant people, newborns, older adults, or those with weakened immune systems. Antibodies indicate past or recent exposure.
["This test helps assess risk of infection from *Listeria*, a foodborne pathogen often linked to contaminated dairy or meat products."]
Key facts at a glance
- LOINC
- 90100-9
- Short code
- Listeria Islt Cult
- Synonyms
- Listeria Islt Cult
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- organism-specific-culture
- 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 symptoms like fever, muscle aches, or gastrointestinal issues after eating potentially contaminated food. It’s also used in high-risk groups (e.g., pregnant women) to monitor for exposure.
How the Test Works
The test detects specific antibodies in your serum or plasma that your immune system produces in response to *Listeria*. These antibodies are measured using an immunoassay method, which identifies their presence without measuring live bacteria.
Sample Collection and Preparation
A blood sample is drawn from a vein, usually in your arm. The blood is processed to separate serum or plasma for testing. This is a simple, painless procedure.
What to Expect Before the Test
No special preparation is needed, but inform your provider about any medications you’re taking, especially antibiotics, which could affect results. Avoid alcohol for 24 hours before testing if instructed.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Positive results suggest recent or past *Listeria* exposure. While antibodies indicate immune response, they don’t confirm active infection. High-risk groups should follow up with their provider for further evaluation if symptoms persist. False positives can occur with cross-reactions, so confirmatory testing may be needed.
Short name
Listeria IgG/IgM Antibody Test
Frequently asked questions
Will this test show if I have *Listeria* right now?
Can I get this test at home?
How long will it take to get results?
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