Competitive ELISA, or Enzyme-Linked Immunosorbent Assay, is a variant of the standard ELISA technique used for measuring the concentration of an antigen in a sample. This method involves the competition between the antigen present in the sample and a labeled antigen for a limited number of binding sites on a specific antibody. The amount of labeled antigen bound to the antibody is inversely proportional to the concentration of the antigen in the sample.
