Serological test for antibodies against SARS-CoV-2 (COVID-19) following vaccination
This test checks if your body has produced antibodies against COVID-19 after receiving a vaccine. Antibodies are proteins that help your immune system recognize and fight the virus.
["Assesses immune response to COVID-19 vaccination—critical for understanding protection status."]
Key facts at a glance
- LOINC
- 97065-7
- Short code
- Hx for COVID -19 vaccine
- Synonyms
- Hx for COVID -19 vaccine
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- 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 Is Done
Your healthcare provider may recommend this test if you’ve recently been vaccinated against COVID-19 to confirm your immune response. It helps ensure your body is building protection against the virus, which may vary depending on your vaccination history and immune status.
What to Expect Before the Test
No special preparation is needed. You’ll provide a blood sample, typically drawn from a vein in your arm. The sample is sent to a lab for analysis to detect specific antibodies linked to COVID-19 vaccination.
What the Results Mean
Positive results indicate the presence of antibodies, suggesting your immune system has likely developed protection. Negative results mean no detectable antibodies were found at this time, but this does not rule out immunity—other factors (like timing since vaccination) may affect antibody levels.
Common Questions About This Test
This test does not measure active infection or current viral load. It focuses solely on antibody presence post-vaccination, which is a key indicator of immune response but not a guarantee of lifelong protection.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Clinical Significance: Antibodies post-vaccination serve as a marker of immune activation but do not replace other measures of protection (e.g., booster status, ongoing vaccination). Levels may decline over time, so follow-up testing or vaccination may be recommended based on guidance from healthcare providers.
Short name
COVID-19 Vaccine Antibody Response
Frequently asked questions
Does this test show if I’m currently infected with COVID-19?
How soon after vaccination should I get this test?
Can I get this test at home?
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