![]() A negative antigen test should be repeated at least 48 hours apart to best detect infection. Antigen tests are less sensitive than NAAT tests and a single, negative antigen test result should not be used to rule out infection. Results on tests done as an outpatient are rarely ready in less than a day and may take much longer.Īntigen tests detect specific viral antigen in a specimen and they provide results relatively quickly, usually within 15-30 minutes. Since NAAT/PCR tests are generally performed in specialized labs, it is a relatively slow process. A NAAT/PCR test should not be used if an individual tested positive within the last 90 days. They are typically performed in a laboratory and are considered the most reliable tests. NAAT tests, such as PCRs, detect viral genetic material which may stay in one's body for up to 90 days after testing positive. There are two main types of viral tests: nucleic acid amplification (NAAT) tests and antigen tests. Viral tests, which are diagnostic tests used to look for current infection, detect the presence of SARS-CoV-2, the virus that causes COVID-19, in specimens. What's the difference between the various test types? Visit COVID19.nj.gov/testing to get a COVID-19 diagnostic test. Please refer to CDC COVID-19 Testing guidance for additional information. It is always best to talk with your health care provider about which test is best for you. One may continue to test positive on a NAAT test for up to 90 days. One may continue to test positive on antigen tests for weeks after an initial positive. Multiple tests may be necessary if the result is negative.Īfter a positive test result, one may continue to test positive for a while after. If you tested positive for COVID-19 in the last 31-90 days, use an antigen test. If negative, multiple tests may be necessary. If you tested positive for COVID-19 in the last 30 days and you have symptoms, use an antigen test. If you tested positive for COVID-19 in the last 30 days and you do not have symptoms, testing is not recommended to detect a new infection. If an antigen test is used and the result is negative, multiple tests may be needed. If you have not had COVID-19 or have not had a positive test within the past 90 days, a NAAT or antigen test can be used. It is recommended to get tested with a viral test no more than 3 days before travel. ![]() You plan to be in contact with someone at high risk for severe illness from COVID-19, especially if you are in an area with a CDC COVID-19 Community Level in Medium or High.You are in high-risk settings where screening testing is implemented.Wait at least 5 full days after your exposure and test on day 6. You have been in close contact with someone who tested positive for COVID-19.You have COVID-19 symptoms, regardless of your vaccination status or if you recently recovered from COVID-19 in the last 90 days.It's especially important to get tested if: Visit covid19.nj.gov/testing to find a testing location near you. Testing is widely available and open to everyone in New Jersey. If you want to find out if you are currently infected with COVID-19, get a diagnostic test.
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