* Grand County Public Health (GCPH) provides free rapid Antigen tests (15-minute tests) to address outbreak and surveillance testing needs across Grand County. If you receive a negative antigen result, but are feeling symptomatic, GCPH recommends getting a PCR test.
PCR (Polymerase Chain Reaction): Usually performed by nasal or oral swab. This test detects the generic material of the virus and can be used to test for several viruses. This is the best test currently available to determine if you have active COVID-19 on the day you are tested. However, it is possible to test PCR negative one day, and then test PCR positive the next based on when your body mounts a response to the infection.
Antibody (serology): A blood test that can determine if your body has viral antibodies. The presence of antibodies suggest that you have been infected with COVID-19 in the past or present. There are three types of antibodies: IgG, IgA, and IgM. IgG indicates past infections; IgA and IgM both indicate current or recent infection.
Antigen: A nasal swab test that looks for proteins that live on the virus' surface. This test detects COVID-19 active disease, but a negative test does not guarantee that you do not have disease.