What is the Covid-19 antibody test?The Covid-19 antibody test requires a small sample of your blood, which is analysed to see if you developed specific antibodies to Covid-19, due to past infection or exposure.
What are the possible results?A positive COVID-19 antibody test means that you developed antibodies to the virus, and suggests that you’ve had the virus in the past, whether or not you had any symptoms.
A negative COVID-19 antibody test means that you have not developed antibodies (or enough antibodies) to the virus at the time of testing, and suggests that you may not have ever had COVID-19. It may also mean that you have a current or recent COVID-19 infection, as it usually takes 1 - 3 weeks after infection for your body to produce antibodies. If you’ve been exposed to the virus recently, you may still become ill, and spread the virus to others.
If you develop COVID-19 symptoms after the antibody test, you should follow Public Health England’s guidance. It may be that you need the COVID-19 swab test, to determine whether or not you are currently infected with the virus.
How accurate is the covid-19 antibody test?If the test is taken at least 2 weeks after COVID-19 infection, the antibody test is 100% specific and 87% sensitive. The antibody test becomes 100% sensitive if taken at least 40 days after COVID-19 infection.
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