Prevention Book

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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)


specificity of measurement (C0681901)

ConceptsQuantitative Concept (T081)
Englishspecificity of measurement
Parent Conceptsspecificity and sensitivity of measurement (C0814893)
SourcesAOD
Derived from the NIH UMLS (Unified Medical Language System)



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