Covid-19

Antibody Blood Test

What Is an Antibody Test?

An antibody test is a screening for things called antibodies in your blood. Your body makes these when it fights an infection, like COVID-19. The same thing happens when you get a vaccine, like a flu shot. That’s how you build immunity to a virus.

You may also hear it called a serology test.

The antibody test isn’t checking for the virus itself. Instead, it looks to see whether your immune system -- your body’s defense against illness -- has responded to the infection.

Keep in mind that current antibody tests can’t tell you if you’re immune to COVID-19. That's because we don't know how long these antibodies might protect you against the coronavirus. And these tests shouldn’t be used to diagnose the virus.

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