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Can return results in as little as 15 minutes. >> the antigen test, the rapid at home test is the right thing to do if you want a rapid time sensitive assessment of whether or not you are infectious right before you go into a gathering. >> reporter: and there are antibody tests which can indicate if you have some protection from a previous covid-19 infection or vaccine. one expert says no matter what kind of tests you want to take because of the test kit shortage it's important to make your test count. if you have just one test available -- >> if you feel symptoms, come on, don't -- don't use ...

Minutes. >> the rapid at-home test is the right thing to do if you want a rapid, time-sensitive assessment. >> and tlr antibody test, which can indicate if you have protection from a previous infection or vaccine. one expert says, it's important to make your test count. if you have just one test available -- >> if you feel symptoms, come on, don't use the test right away. assume you are positive and isolate and quarantine. use the test on day two or three. >> reporter: another key piece of advice, as we're getting to more holiday gatherings. if you have a test at home or hosting a gathering, t...

Go into a gathering. >> reporter: and there are antibody tests, which can indicate if you have some protection from a previous covid-19 infection or vaccine. one expert says no matter what kind of test you want to take, it's important to make your test count. >> if you feel symptoms, don't use the test right away. assume you are positive and isolate and quarantine. use the test on day two or day three. >> reporter: another key piece of advice we are getting, experts say if you have a test at home and you are hosting a holiday gathering, take the test as close in time to the gathering as you ca...

You want if you want to figure out to go back to the office or travel. there are also rapid antigen tests which people can conduct at home which are cheaper and can return results in as little as 15 minutes. >> the antigen test, that rapid at-home test is the right thing to do if you want a rapid time-sensitive assessment of whether or not you're infectious right before you go into a gathering. >> and there are antibody tests which can indicate if you have some protection from a previous covid-19 vaccine and no matter the kind of test you want to take it's important to make your test count. if...

>> reporter: and there are antibody tests which could indicate if i have protection from a previous infection or vairk. no matter what kind of test you want to take, because of the test kit shortage, it is important to make your test count. if you have just one test available -- >> if you feel symptoms, come on, don't use the test right away. a a assume you are positive and isolate and quarantine. use the test on day two or day three. >> reporter: and another key piece of advice we're getting from experts as many of us are now going to more holiday gatherings, if you have a test at home and yo...