PCR tests are the “gold standard” among corona tests because the test result is the most accurate. The sample collection is done by medical personnel – the evaluation by laboratories. Rapid antigen tests for SARS-CoV-2 work on a similar principle to pregnancy tests. They can only be performed by trained personnel – for this purpose, a nasal or throat swab is taken, similar to the PCR test. However, in contrast to the PCR test, the evaluation is carried out directly on site and is available within 15 minutes. Lay self-tests are intended for use by private individuals. For this purpose, sample collection and evaluation must be correspondingly simple.