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What is Antibody Testing
IgG/IgM Antibodies Test

Verify that you had COVID-19.

Schedule online. It's easy, fast and secure.

IgG/IgM Antibody Fact Insights 
  • Antibodies are proteins that help fight off infection

  • Takes 7-14 days after infection to make antibodies - some 7-21 days

  • You may test positive for antibodies even if you have never had symptoms

  • 1 in 5 people infected with COVID-19 are asymptomatic

  • About 40% of infections are spread by asymptomatic people w/ high viral loads

  • The presence of IgG suggests the infection happened weeks to months in the past

  • The presence of IgM suggests the infection is recent - as recent as 3 days ago

What are the Symptoms of COVID-19 Infection?
  • Fever or chills

  • Cough

  • Shortness of breath

  • Fatigue

  • Muscle or body aches

  • Headache

  • New loss of taste or smell

  • Sore throat

  • Congestion or runny nose

  • Nausea or vomiting

  • Diarrhea

What do your Antibody results mean?
If you test positive
  • A positive test result shows you may have antibodies from an infection with the virus that causes COVID-19. However, there is a chance that a positive result means you have antibodies from an infection with a different virus from the same family of viruses (called coronaviruses). Note: Other coronaviruses cannot produce a positive result on a viral test for SARS-CoV-2.

  • Having antibodies to the virus that causes COVID-19 may provide protection from getting infected with the virus again. But even if it does, we do not know how much protection the antibodies may provide or how long this protection may last. Confirmed and suspected cases of reinfection have been reported, but remain rare.

  • If you work in a job where you wear personal protective equipment (PPE), continue wearing PPE.

  • You may test positive for antibodies even if you have never had symptoms of COVID-19. This can happen if you had an infection without symptoms, which is called an asymptomatic infection.

If you test negative
  • You may not have ever had COVID-19. Talk with your healthcare provider about your test result and the type of test you took to understand what your result means

  • You could have a current infection or been recently infected.

  • The test may be negative because it typically takes 1–3 weeks after infection for your body to make antibodies. It’s possible you could still get sick if you have been exposed to the virus recently. This means you could still spread the virus.

  • Some people may take even longer to develop antibodies, and some people who are infected may not ever develop antibodies.

If you get symptoms after the antibody test, you might need another test called a viral test​. Viral tests identify the virus in samples from your respiratory system, such as a swab from the inside of your nose. 


Regardless of whether you test positive or negative, the results do not confirm whether you are able to spread the virus that causes COVID-19. Until we know more, continue to take steps to protect yourself and others.