COVID-19 tests

Target and technical principle

COVID-19 names the infectious context but does not by itself identify the analytical target. Viral antigen and genetic material are different markers. Antigen and molecular devices therefore use different constructions and reagents. An antibody test represents another approach and should not be equated with direct detection of the virus. This distinction explains why technologies cannot be compared through external format alone. A cassette-like presentation describes housing rather than proving what substance or marker the device is designed to detect.

Samples and kit components

Nasal and nasopharyngeal sampling are not the same sample arrangement. Swabs, tubes, extraction solutions and reading devices may be separate kit components. Their number and degree of integration vary with the construction. A transport medium is not automatically a compatible extraction buffer. The device’s purpose needs to identify the accepted sample without borrowing a collection method from another test that looks similar. The collection accessory and the analytical device remain distinct elements within the complete system.

Self-testing, professional use and reading

A self-test is designed for a particular user and set of conditions; a professional test has its own intended purpose. Individual packaging does not prove self-test status. Reading may be visual or instrument-based according to the system. Result and control areas provide different information, without constituting instructions here. Performance and limitations belong to the particular test rather than a universal promise attached to the family name. The category describes the technology without interpreting an individual result or determining a clinical response.

Frequently asked questions