specificity

When referring to a medical test, specificity refers to the percentage of people who test negative for a specific disease among a group of people who do not have the disease. No test is 100% specific because some people who do not have the disease will test positive for it (false positive).

An epidemiologic measure of how often people who do not have some condition are correctly identified by a test as not having that condition (“true negatives”) instead of as a “false positive” test result.

For diagnostic tests, the ability of a probe to react precisely and uniquely with its target molecule.