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==Introduction==
==Introduction==
[[Image:ELISA.jpg|thumb|right|150px|Double Antibody Sandwich ELISA]]
The Enzyme Linked Immunosorbent Assay (ELISA) is an immunoassay commonly used to detect the presence of an antigen or antibody in a sample. It is a powerful tool in clinical immunology and can be used to determine whether an individual is positive for a specified pathogen, so is often the first test used in disease diagnosis. Utilizing the principle of antigen-antibody interaction, the test allows easy visualisation of results and, since its introduction in 1971, has quickly replaced radioimmunoassays for diagnostic purposes.
The Enzyme Linked Immunosorbent Assay (ELISA) is an immunoassay commonly used to detect the presence of an antigen or antibody in a sample. It is a powerful tool in clinical immunology and can be used to determine whether an individual is positive for a specified pathogen, so is often the first test used in disease diagnosis. Utilizing the principle of antigen-antibody interaction, the test allows easy visualisation of results and, since its introduction in 1971, has quickly replaced radioimmunoassays for diagnostic purposes.