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Test SpecificityAka: Specificity

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  1. Definition
    1. Screening Test correctly negative in absence of disease
    2. A test with high specificity has few false positives
    3. Independent of disease Prevalence in the community
  2. Calculation
    1. True negative tests per unaffected patients tested
    2. Expressed as a percentage
  3. Example: A new Screening Test for Crohn's Disease
    1. Patients without Crohn's Disease tested: 255
    2. Patients who have a negative test: 230
    3. Specificity = 230/255 or 90%
  4. References
    1. Hennekens (1987) Epidemiology Medicine, p.327-47
    2. Gates (2001) Am Fam Physician 63(3):513
    3. MacLean (1996) Med Clin North Am 80(1):1
    4. Nielsen (1999) Med Clin North Am 83(6):1323

Specificity (C0037791)

ConceptsQuantitative Concept (T081)
MSHD012680
EnglishSpecificity
SourcesMSH
Derived from the NIH UMLS (Unified Medical Language System)



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