Anti-SARS-CoV-2 Nucleocapsid Protein Antibody, Serum/Plasma (Qualitative)
This test detects antibodies to the nucleocapsid protein of SARS-CoV-2, the virus responsible for COVID-19. It helps determine if your immune system has recognized and fought the virus, potentially indicating past infection.
["This test checks for immunity to COVID-19 by measuring antibodies to the virus’s core protein."]
Key facts at a glance
- LOINC
- 95825-6
- Short code
- SARS-CoV-2 Ab DBS Ql IA
- Synonyms
- SARS-CoV-2 Ab DBS Ql IA
- 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
Why This Test Might Be Ordered
Your healthcare provider may order this test if you’ve had symptoms of COVID-19, recovered from it, or were exposed to the virus. It can also be used for screening or monitoring in certain settings, such as healthcare workers or travelers. Some tests are done to confirm past infection rather than active illness.
What to Expect Before the Test
No special preparation is needed. You’ll provide a blood sample, usually drawn from a vein in your arm. The sample is collected in a tube and sent to the lab for analysis. Results are typically qualitative (positive or negative) and not tied to specific numeric values.
How the Test Works
The test uses an immunoassay method to detect antibodies in your blood. These antibodies are proteins your immune system produces in response to the nucleocapsid protein of SARS-CoV-2. If antibodies are present, the test will indicate a positive result, suggesting past infection.
What the Results Mean
A positive result means your body has likely been exposed to SARS-CoV-2 and developed antibodies against its nucleocapsid protein. This does not confirm current infection but indicates immunity from past exposure. A negative result means no detectable antibodies were found, which may mean you were never infected or the test was taken too early after exposure.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Clinical Significance
Short name
Anti-Nucleocapsid Antibody (Qualitative)
Frequently asked questions
This test is primarily used to identify past infection rather than active disease. It can help guide decisions about vaccination, exposure risk, or screening in certain populations. However, it should not replace other diagnostic tests like PCR for confirming current infection.
A negative result means no antibodies were detected at the time of testing. This could mean you were never infected, the test was taken too soon after exposure, or the antibodies were not yet detectable. Follow-up testing may be recommended if you suspect exposure.
The test is not used to diagnose active COVID-19 infection. For that, other tests like PCR or antigen tests are typically used. If you have symptoms of COVID-19, consult your healthcare provider about appropriate testing.
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