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The exact definition of immunoassay can vary based on where and in what environment it is being used. For example, Wikipedia defines it as “…a biochemical test that measures the concentration of a substance in a biological liquid, typically serum or urine, using the reaction of an antibody or antibodies to its antigen.”  A dentist may define it differently from a veterinary though. The terms typically associated with immunoassays stay relatively consistent though, as seen in the glossary below.