Here are answers to common patient questions on diagnostic tests for COVID-19.

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I've heard about new antibody testing for COVID-19. What is antibody testing? Is it the same as testing to diagnose COVID-19?

Answer: With all the talk about coronavirus disease 2019 (COVID-19) testing in the news, it's not surprising that there's confusion about tests and how they differ. Antibody testing determines whether you had COVID-19 in the past and now have antibodies against the virus. A test to diagnose COVID-19 determines if you currently have the disease. Here's what you need to know about testing.