Diagnostic antibodies are antibodies against marker molecules of disease, such as tumours, myocardial damage or inflammation, kidney damage, bacterial infections, infectious diseases and other marker molecules. They are used to diagnose or exclude diseases and are used for disease screening, detection and diagnosis. Diagnostic antibodies are widely used in in vitro diagnostic kits, including enzyme-linked immunoassays, chemiluminescent assays, colloidal gold assays, immunoturbidimetric assays, etc.