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Skip to content Students Connecting student life at WashU Close Find Resources Search for: Search What I Need COVID-19 Information Contacts Get Crisis Support Information View Safety Information Find a Location Attend an Event Plan an Event Find a Form or Policy Departments Athletics Campus Life Center for Career Engagement Center for Diversity and Inclusion Dialogue Across Difference (DxD) Disability Resources Gateway Battalion | St. Louis Army ROTC Habif Health and Wellness Center Office for International Student Engagement Office for International Students and Scholars Office for Religious, Spiritual and Ethical Life Office of Military &＃038; Veteran Services Office of Scholar Programs Recreation Relationship and Sexual Violence Prevention Center Residential Life Student Conduct and Community Standards Student Transitions &＃038; Family Programs Taylor Family Center for Student Success TRIO Student Support Services WashU Cares All Resources Search for: Search Health and Wellness Habif Health and Wellness Center PCR vs AG tests for COVID-19 There are two types of COVID tests, a PCR test and an Antigen test. The PCR test measures genetic material from the virus and is a very sensitive test for detecting COVID-19. It has the potential to remain positive for up to 90 days even though the virus particles may no longer be alive or have the potential to infect others. Hence, we do not recommend retesting with a PCR test within 90 days of a positive result unless there are mitigating circumstances. The Antigen test looks for a protein on the surface of the virus. One needs enough virus to be present in the sample to pick up this protein in the test and have a positive result. The antigen test usually reverts to negative within 5-14 days after infection. How well do antigen tests work? In general, they may be able to catch most, but not all, cases of COVID-19 that are contagious at the time of the test. They are not as sensitive as PCR tests, which means that some people can have COVID-19 with a negative antigen test (i.e. a false negative). Antigen tests are more accurate when symptoms are present and may miss more than 50% of asymptomatic cases and 20% of symptomatic cases. What are the best uses of antigen tests when I do not have any symptoms? Antigen tests can play an important supportive role in preventing the spread of COVID-19. Note that a negative test result does NOT rule out infection, but it does make it less likely. If you donʼt have symptoms, it is still important to consider taking extra precautions such as masking while indoors when around people who could be at high risk of serious COVID-19 complications. When community transmission levels are high, a positive test likely indicates true infection and should be treated as such. Antigen tests can also be useful to try to detect early infection in those who have had a known close-contact exposure. A test taken 3-5 days after exposure will sometimes detect infection before symptoms are noticed. What are the best uses of antigen tests when I do have symptoms? If you have symptoms that could be due to COVID-19, an antigen test may be able to quickly confirm that you have infection. A positive test in that setting suggests that you have the infection and that you can pass it to others. You should treat a positive test as a true result.  A negative antigen test does NOT rule out infection, you can book an appointment at Habif to obtain a PCR test (see below). How can I obtain a COVID-19 Antigen test? Antigen tests are available at most local pharmacies, including Quadrangle Pharmacy located within Habif Health and Wellness Center. How can I obtain a COVID-19 PCR Test? If your antigen test is negative and you are experiencing symptoms, PCR testing can be completed. There is on campus PCR testing available at Habif Health and Wellness Center Monday through Friday. Your student insurance is billed for this testing. If you would like to use this service please email Habif or call 314-935-4959 to arrange a test. Walk-in testing is not available.   Related Resources What to do if you have been exposed to COVID-19 If you were exposed to someone with COVID-19, Please follow these updated CDC guidelines. COVID-19/Influenza and other Respiratory Illnesses WashU follows best practices from the CDC and our local departments of health for isolating in place if students test positive for COVID-19. Testing negative for COVID-19 but having symptoms? Watch this video for your next steps. Community Living Diversity and Inclusion Student Involvement Healthy Excellence Student Success Career Engagement About the division: Danforth University Center, Suite 200 [email protected] 314-935-4526 Hours: Mon-Fri 8:30 a.m.-5 p.m. LEARN ABOUT THE DIVISION Additional Contacts: Habif Health and Wellness Center 314-935-6666 Residential Life 314-935-5050 Resources for: New students Graduate and professional students Parents and family members Have a question or complaint? We love to hear from you. Send us questions or concerns through our confidential form. Student feedback form ©2024 Washington University in St. Louis