SARS-CoV-2 Neutralizing Antibody Titer, Serum/Plasma
This test measures how well your immune system produces antibodies that can neutralize the virus responsible for COVID-19. It helps determine if you’ve been exposed to the virus and developed immunity.
["This test checks for immune response to COVID-19, aiding in understanding protection status."]
Key facts at a glance
- LOINC
- 95410-7
- Short code
- SARS-CoV-2 NAb Titr Ser pVNT
- Synonyms
- SARS-CoV-2 NAb Titr Ser pVNT
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- pvnt
- 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 Does This Test Measure?
The test detects antibodies that directly block the virus from infecting cells. These neutralizing antibodies are part of your body’s defense mechanism after exposure to SARS-CoV-2. The titer (or level) indicates how strongly your immune system is responding.
Why Might You Need This Test?
Healthcare providers may order this test to assess immunity after COVID-19 infection, evaluate vaccine response, or guide decisions about exposure risk or precautions. It’s not a replacement for other COVID-19 tests like PCR or antigen tests.
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, which is then tested for neutralizing antibodies. This process typically takes a few hours in the lab.
What to Expect Before the Test
No special preparation is needed, but inform your provider about any medications you’re taking or recent illnesses. Avoid alcohol before the blood draw if possible, as it may affect blood clotting.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
A positive neutralizing antibody titer suggests you’ve likely been exposed to SARS-CoV-2 and developed immunity. However, antibody levels can decline over time, so results may not be permanent. High titers may indicate a stronger immune response, while lower levels could mean less protection. This test is useful for monitoring immunity but isn’t a definitive measure of current infection risk.
Short name
SARS-CoV-2 NAb Titer
Frequently asked questions
How Long Does It Take to Get Results?
Can This Test Detect COVID-19 Infection?
Are Antibody Levels Always Reliable?
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