Immunodiagnosis is a technique used to diagnose diseases by detecting and measuring specific antibodies or antigens in a patient’s blood or other bodily fluids. This technique relies on the body’s immune system response to a particular disease-causing agent, which can be detected through various laboratory tests such as enzyme-linked immunosorbent assay (ELISA), Western blotting, or immunofluorescence. Immunodiagnosis is widely used in the diagnosis of infectious diseases, autoimmune disorders, and cancer, and has proven to be a valuable tool in the field of medical diagnosis and research