Semantics are the problem here. Media and lay people and non medical folks use the word "test" to refer to several things that while they may constitute a test, they are not what you really mean to say.
https://www.cdc.gov/coronavirus/2019-nco...sting.html
Viral tests are used to look for current infection
A viral test checks specimens from your nose or your mouth to find out if you are currently infected with the virus that causes COVID-19. Viral tests can be performed in a laboratory, at a testing site, or at home or anywhere else. Two types of viral tests are used: nucleic acid amplification tests (NAATs) and antigen tests.
Who should get tested
The following people should get tested for COVID-19:
People who have symptoms of COVID-19.
People who are fully vaccinated with COVID-19 vaccine should be evaluated by their healthcare provider and tested for COVID-19 if indicated.
People without symptoms of COVID-19 such as:
People not fully vaccinated with COVID-19 vaccine who have had close contact with someone with confirmed COVID-19 (including a person who does not have symptoms within 10 days of their positive test result).
People not fully vaccinated with COVID-19 vaccine who have taken part in activities that put them at higher risk for COVID-19, such as attending large social or mass gatherings, or being in crowded indoor settings.
People not fully vaccinated with COVID-19 vaccine who are prioritized for expanded community screening for COVID-19.
People not fully vaccinated with COVID-19 vaccine who have been asked or referred to get testing by their school, workplace, healthcare provider, state, tribal, localexternal icon or territorial health department.
Who does not need to be tested
The following people who have been exposed to someone with COVID-19 do not need to get tested if they do not have COVID-19 symptoms:
Persons who are fully vaccinated with COVID-19 vaccine not living in a congregate setting.
For residents in non-healthcare congregate settings (e.g. correctional and detention facilities, group homes) and employees of residential congregate settings and high-density workplaces (e.g. meat and poultry processing and manufacturing plants), refer to CDC’s recommendations for fully vaccinated people.
People who have tested positive for COVID-19 within the past 3 months and recovered, as long as they do not develop new symptoms, do not need to get tested.
Updated Feb. 2, 2021
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Antibody or serology tests look for antibodies in your blood that fight the virus that causes COVID-19.
Antibodies are proteins created by your immune system that help you fight off infections. They are made after you have been infected or have been vaccinated against an infection.
Antibodies help you fight off infections and can protect you from getting that infection for some period of time afterward. How long this protection lasts is different for each disease and each person.
Antibody tests should generally not be used to diagnose a current infection with the virus that causes COVID-19. An antibody test may not show if you have a current infection because it can take 1 to 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.
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Self-checker
A tool to help you make decisions and seek appropriate medical care
About the Tool
How to get an antibody test
Decisions about testing are made by state or localexternal icon health departments or healthcare professionals.
Antibody tests for COVID-19 are available through healthcare professionals and laboratories. Check with your healthcare professional to see if they offer antibody tests and whether you should get one.
What your results mean?
If you test positive
A positive antibody test result shows you may have antibodies from a previous infection with the virus that causes COVID-19.
Antibodies to the virus that causes COVID-19 provide protection from getting infected. CDC is evaluating how long protection from antibodies might last. Cases of reinfection have been reported, but remain rare.
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.
Sometimes a person can test positive for SARS-CoV-2 antibodies when they do not actually have those specific antibodies. This is called a false positive.
Talk with your healthcare professional about your test result and the type of test you took to understand what your result means. Your healthcare professional may suggest you take a second type of antibody test to see if the first test was accurate.
If you test negative
You may not have COVID-19 antibodies. This could be because you have not had an infection with the virus that causes COVID-19.
You could have a current infection, been recently infected, or been recently vaccinated. It typically takes 1 to 3 weeks after infection for your body to make antibodies. If you are infected, you may get sick and spread the virus before you develop antibodies.
Some people may take even longer to develop antibodies, and a small portion of people who are infected or vaccinated may never develop antibodies.
Sometimes people test negative for SARS-CoV-2 antibodies when they have those specific antibodies. This is called a false negative.
Talk with your healthcare professional about your test result and the type of test you took to understand what your result means.
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.