Antigen testing is the quickest way to get a result for Covid-19, but these tests are not as sensitive or accurate as a RT-PCR test in detecting a viral infection.  Results can be attained in roughly 15 minutes and a nasopharyngeal swab is performed. Monarch Diagnostics utilizes the Sienna-Clarity antigen rapid test cassette which has been authorized by the FDA under an emergency use authorization. Antigen tests differ from PCR tests in that they only screen for the protein of the virus, meaning false negatives are quite common if you are asymptomatic or already past the early stages of contracting the virus. One of the disadvantages of antigen testing is that they are not widely accepted as proof of a negative result by many entities including employers, healthcare offices, schools, social events, and travel.