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Related to diagnostic specificity: diagnostic sensitivity
the probability (P) that, given the absence of disease (D), a normal test result (T) excludes disease; that is, P(T/D).
the conditional probability that a person not having a disease will be correctly identified by a clinical test, i.e., the number of true negative results divided by the total number of those without the disease (which is the sum of the numbers of true negative plus false positive results).
di·ag·nos·tic spe·ci·fi·ci·ty(dī-ăg-nos'tik spes'i-fis'i-tē)
1. The probability (P) that, given the absence of disease (D), a normal test result (T) excludes disease; i.e., P(T/D).
2. Specificity (%) = number of patients without the disease who test negative × 100 ÷ total number tested without the disease.
For a diagnostic or screening test, the proportion of people who are truly free of a specific disease and are so identified by the test.See: sensitivity
See also: specificity