SARS-CoV-2 is neocoronavirus, and neocoronavirus antigenic self-testing uses a four-step process of antigenic self-testing pre-preparation, sample collection, antigenic testing, and interpretation of results. The International Committee for the Classification of Viruses named 2019 New Coronavirus Disease as SARS-CoV-2, while the official name of New Coronavirus Pneumonia is COVID-19. 1.Preparation before antigen self-test. First wash your hands. Then read the instructions carefully. After checking the condition of the swab, sampling tube and test card, lay the test card flat in a clean place. 2. Sample collection. First remove the nasal swab without touching the swab head. With the head tilted back slightly, insert the swab into the nostril with one hand, slowly penetrate 1-1.5 cm into the nasal cavity, rotate the swab against the nasal cavity at least 4 times, and continue the process for 15 seconds. Remove it and then use the same swab and perform the same operation on the other side of the nasal cavity. Adults can self-sample, while children are sampled by an adult. 3. Antigen detection. The sample is tested according to the instructions of the kit and the results are read after a short period of time. 4. Interpretation of results. Positive results are indicated by red or purple bands at both “C” and “T”; red or purple bands are indicated at “C”, but no bands are indicated at “T”. The presence of a red or purple band at the “C” site and no band at the “T” site is considered a negative result. The absence of a band at the “C” site is considered invalid, regardless of whether or not a band is present at the “Consumption” site. The antigen self-test is a complementary test to the new coronavirus test and is not a substitute for the nucleic acid test. It is recommended that the diagnosis be made under the guidance of a doctor and in conjunction with the results of the nucleic acid test, rather than blindly diagnosing the disease on your own, as this may affect your condition. Tip: “New coronavirus pneumonia and new coronavirus pneumonia” mentioned in this article have been renamed to “new coronavirus infection” on December 26, 2022, as announced by the National Health Commission.