I have searched for several references related to Rapid Antigen.
or there are also those who call and write with Swab Antigen.
Some even mention the accuracy rate of up to 97%.
But I did not find it from the best local sources such as the Ministry of Health.

Here is the WHO version.
A new technology for COVID-19 detection has become available that is much simpler and faster to perform than currently recommended nucleic acid amplification tests (NAATs), such as PCR.
The method relies on direct detection of SARS-CoV-2 viral proteins in nasal swabs and other respiratory secretions using a lateral flow immunoassay (also called RDT) that provides results within <30 minutes.
Although these antigen detection RDTs (Ag-RDTs) are substantially less sensitive than NAAT, they offer the possibility of rapid, low-cost and early detection of the most infectious COVID-19 cases in appropriate settings.

Source : who.int