All healthcare providers performing antigen testing are obliged to report the result electronically to the Infectious Disease Information System (ISIN) without delay.
As of 9 March, the Ministry of the Czech Republic orders:
Pursuant to Art I., all healthcare service providers who perform examinations to determine the presence of the SARS-CoV-2 virus antigen using POC antigen tests are ordered to report, electronically and without undue delay, information about every result of the POC antigen tests to determine the presence of SARS-CoV-2 virus antigen into the Information System of Infectious Diseases (ISIN). A mandatory part of the reported information about the result of the POC antigen test is information about whether the patient is symptomatic or asymptomatic.
The complete text can be found here.