01-08-2020 (1832 lectures) | Categoria: Medicina |
Antibody or serology tests look for antibodies in your blood to determine if you had a past infection with the virus that causes COVID-19.
Antibody tests should not be used to diagnose a current infection with the virus that causes COVID-19, except in instances in which viral testing is delayed. An antibody test may not show if you have a current infection because it can take 1–3 weeks after the infection for your body to make antibodies.
Whether you test positive or negative for COVID-19 on a viral or an antibody test, you still should take steps to protect yourself and others.
We do not know how much protection (immunity) antibodies to the virus might provide against getting infected again. Confirmed and suspected cases of reinfection have been reported, but remain rare. Scientists are working to understand this.
A tool to help you make decisions and seek appropriate medical care
Decisions about testing are made by state or local health departments or healthcare providers.​
Antibody tests for COVID-19 are available through healthcare providers and laboratories. Check with your healthcare provider to see if they offer antibody tests and whether you should get one.
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.
Learn more about using antibody tests to look for past infection.
For information on evaluating and testing for active infection, see recommendations for reporting, testing, and specimen collection.
For CDC interim guidance on antibody testing in clinical and public health settings, see Interim Guidelines for COVID-19 Antibody Testing.