Diagnostic agents are medicines used to recognize the diagnosis of diseases. So, to determine the secretory function of the stomach use histamine, for viewing the fundus apply drugs of the atropine group; To diagnose latent bronchial asthma, trententhol is prescribed, etc. Radiopharmaceutical preparations are widely used for diagnostic purposes – substances labeled with radioactive isotopes.
Various immunological drugs have been developed and are being used, which have a specific application and are prescribed by special methods. For magnetic resonance imaging and ultrasound studies, special contrast media have been created that allow improving the image quality of certain tissues, organs and pathological foci. However, in everyday diagnostics, radiopaque agents and some other diagnostic drugs are most widely used.