assay datum diagnostic test type A test category used to group diagnostic tests based on generla characteristics, such as the target for detection (antigen or antibody). Categorization of diagnostic tests used in health surveillance. This information can be assigned to a test, or inferred from test characteristics if enough information is given about it. Known diagnostic tests can be classified into groups here so that information such as whether they are an antibody detection or pathogen identification information can be associated to the test, even if this information is not detailed in the data source. As an example, diagnostic tests classifications contained in existing terminologies (such as EFSA SSD2, https://www.efsa.europa.eu/en/efsajournal/pub/3424) can be used to create specific test catehories here.