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NCI Dictionary of Cancer Terms

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NCI Dictionary of Cancer Terms



immunoassay  listen  (IH-myoo-noh-A-say)

  A test that uses the binding of antibodies to antigens to identify and measure certain substances. Immunoassays may be used to diagnose disease. Also, test results can provide information about a disease that may help in planning treatment (for example, when estrogen receptors are measured in breast cancer).