Prevention Book

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Test Sensitivity

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  1. Definition
    1. Screening Test's ability to identify true disease
    2. A Test with high sensitivity has few false negatives
    3. Independent of disease Prevalence in the community
  2. Calculation
    1. True positive tests per total affected patients tested
    2. Expressed as a percentage
  3. Example: A new Screening Test for Crohn's Disease
    1. Patients with known Crohn's Disease tested: 45
    2. Patients who have a positive test: 36
    3. Sensitivity = 36/45 or 80%
  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

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