A positive test result indicates that you may have had a previous exposure to the virus that causes COVID-19 and your body has developed specific antibodies to the virus, regardless of whether you developed symptoms. A positive antibody test does not confirm infection or immunity. It is currently unknown whether the presence of COVID-19 antibodies will provide immunity to future infection, although this has been shown to be the case in similar viruses for a period of time. If your test result is positive, the Red Cross may contact you to request additional information and conduct further testing as part of a research study. If additional testing occurs, you will be notified of the results by mail.
A negative test result means that you probably have not been exposed to COVID-19 and therefore have not developed antibodies to the virus. It also could indicate that antibodies are present but at levels below the test’s threshold for detection, or that the test did not recognize those antibodies. It is possible that you can still contract the virus, if exposed. It takes one to three weeks after an infection for antibodies to be present.
A not available test result means that your test result is not yet available or your donation was not tested. Please wait for seven to 10 days after your donation to confirm that your sample has completed the testing process. If it has been 10 days or more after your donation and your result is still not available, your donation was not tested. Per standard procedures, only successful donations are sent to our laboratory for testing.