What is an antibody test?
An antibody test can tell someone whether they have had the virus that causes Covid-19 in the past, by analysing a blood sample.
What do antibody test results mean?
A positive antibody test demonstrates that someone has developed antibodies to the virus. The presence of antibodies signals that the body has staged an immune response to the virus.
Covid-19 is a new disease, and our understanding of the body’s immune response to it is limited. We do not know, for example, how long an antibody response lasts, nor whether having antibodies means you can’t transmit the virus to others.
Our understanding of the virus will grow as new scientific evidence and studies emerge.
An antibody test result can only tell an individual whether or not they have had the virus in the past. Antibody tests are also being used currently in surveillance studies, to understand what proportion of the population have already had the virus.
If you test positive for antibodies, does that mean you are “immune” to the coronavirus?
No. There is no evidence yet to suggest that those who have been proven to have had the virus are immune. This is the position of the World Health Organisation.
If you test positive for antibodies, can you ignore lockdown restrictions?
No. You should continue to comply with social distancing measures and government guidelines. All infection prevention and control measures must continue to be in place irrespective of the presence of antibodies.
How will my information be used?
The anonymised results across the testing programme will provide information on the prevalence of COVID-19 in different regions of the country and help better understand how the disease spreads.
Are there any risks to having the test?
A positive test may influence some life insurance or mortgage applications. The British Medical Association have clarified the situation, stating:
“A positive test for COVID (either a PCR or antibody test) should not delay an application as long as the individual has recovered and been back at work for the required period.” BMA, June 2020
There are some physical risks related to having a blood test, such as feeling dizzy and faint during and after the test but nothing specific to this antibody test. Risks can also include bruising at the blood taking site. Serious complications such as an infection at the site where blood was taken and phlebitis (swelling of the vein) are possible but generally extremely unlikely.