2019-nCOV Antigen Test" likely refers to a diagnostic test for the detection of the novel coronavirus SARS-CoV-2, which is responsible for the respiratory illness known as COVID-19. The "2019-nCOV" designation refers to the virus discovered in 2019.
Antigen tests are designed to detect specific proteins on the surface of the virus. They are often used as rapid tests to quickly identify individuals who are currently infected with SARS-CoV-2. These tests are particularly useful for screening purposes, providing results in a shorter timeframe compared to molecular tests like PCR.