Rapid Antigen Tests are diagnostic tools used to quickly detect the presence of specific antigens, which are substances that trigger an immune response. These tests are commonly used for identifying infections, such as COVID-19, by providing results in as little as 15 to 30 minutes. They are typically performed using a nasal swab or saliva sample. These tests are convenient and can be conducted at home or in various settings, such as clinics and schools. While they are faster than traditional PCR tests, they may be less accurate, especially in individuals with low viral loads. Therefore, positive results may require confirmation through more sensitive testing methods.