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Antibody Test

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Antibody Testing Process

Antibodies are proteins made by the immune system to fight infections like viruses and may help to ward off future occurrences by those same infections. Antibodies can take days or weeks to develop in the body following exposure to a SARS-CoV-2 (COVID-19) infection and it is unknown how long they stay in the blood.
Antibody tests detect antibodies produced by the body’s immune system in response to SARS-CoV-2. The Commonly tested antibodies are IgG and IgM. COVID-19 serology tests can tell whether or not you have had the viral infection in the past. However, antibody tests are not the preferred tests to diagnose current infections.

Specimen

Taking a blood sample from the finger

What the test will look for

Putting blood sample on a testing template

Laboratory Testing

blood is then examined for types of antibodies (IgM & IgG )

Lab-testing-main image
COVID-19 antibody test detects antibodies reactive to SARS-CoV-2 viral proteins. This test can be used to assess recent or previous infection with SARS-CoV-2. This test is most accurate when sample is collected 3-4 weeks after onset of symptoms or 3-4 weeks after exposure. At this time, it is not known if the presence of antibodies to COVID-19 means you are immune to the virus and protected from re-infection. Importantly, it is not known how long antibody response to COVID-19 virus lasts. Based on current studies, antibodies to COVID-19 virus can be detected up to 4 months post-exposure, but levels vary depending on individual immune response as well as disease severity, with levels higher in severe and lower in milder/asymptomatic cases.

When Antibody testing for COVID-19 required?

Antibody testing for COVID-19 may be done if:
  • You had symptoms of COVID-19 in the past but weren't tested.
  • You're about to have a medical procedure done in a hospital or clinic, especially if you've had a positive COVID-19 diagnostic test in the past.
  • You've had a COVID-19 infection in the past and want to donate plasma, a part of your blood that contains antibodies that can help treat others who have severe cases of COVID-19.

Frequently Asked Questions

The frequently asked questions (FAQs) on this page are for a general public or consumer audience.
A positive test result means that you most likely have COVID-19 now and should self-isolate: stay home, separate yourself from others, and take precautions to reduce the risk of spreading the virus, including using a face covering and practicing good hand hygiene and physical distancing. If your symptoms get worse, you should contact your local health care provider by phone.