The SARS-CoV-2 Neutralising Antibody Test detects the presence of antibodies that have a blocking or neutralising function (i.e. neutralising antibodies) against the COVID-19 virus
IF YOU HAD a COVID-19 infection in the past, there would be antibodies in your body, but they might not function the way you want them to. Some antibodies bind to the viral antigens but do not block them from infecting your cells. Neutralising antibodies are the immune proteins that protect you, as they stop the virus from releasing its harmful effects.
The test assesses the level and longevity of your immunity — the effectiveness of your vaccine, or whether you have been previously infected. A positive result indicates how well your immune system is prepared against the virus. The higher your level of neutralising antibodies, the better your immunity.
Many antibody tests, such as IgM, IgG, or total antibody, do not tell whether the antibodies detected can provide protective immunity. Taking the test two weeks after you have been vaccinated, or recovered from an infection, can be an accurate way to check whether you have developed immunity towards COVID-19.
Like other antibody tests, the NAb test is a blood test, and provides a number value to the antibodies developed post-vaccination.
When should we be tested?
The test is ideally done a minimum 2 weeks after them second dose of vaccination, as it takes a few weeks for the body to develop an immune response.
You can also choose to get tested before the first dose as a baseline. Another test may be required at a later date to determine the need for a booster dose.
What does a positive result mean?
Most people develop protective antibodies after getting vaccinated. Antibodies may also be detected after a past infection which leads to development of natural immunity.
Know your immune status and stay protected
Disclaimer: A positive antibody result will not indicate if it is due to vaccination or a previous COVID-19 infection.