Dictionary of Human Evolution and Biology

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Specificity

1. selectivity; inability of an antibody to detect the presence of unrelated antigens, even at low antigen levels.

2. in the context of a test for diagnosing a disease condition, specificity is defined as the proportion of people without a disease who test negatively for the disease.

3. in serology, the capacity of an antigen to react exclusively with red cells that have the corresponding antigenic determinants in common.

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