Enzymes are frequently used as diagnostic markers for various diseases. For example, elevated levels of liver enzymes like alanine aminotransferase (ALT) and aspartate aminotransferase (AST) can indicate liver damage or disease. Similarly, enzymes like creatine kinase (CK) are used to diagnose myocardial infarction. Enzyme-linked immunosorbent assay (ELISA) is a common laboratory technique that employs enzymes to detect the presence of antigens or antibodies in a sample, aiding in the diagnosis of infections and autoimmune diseases.
