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Screening, in medicine, is a strategy used in a population to identify an unrecognised disease in individuals without signs or symptoms. This can include individuals with pre-symptomatic or unrecognised symptomatic disease. As such, screening tests are somewhat unique in that they are performed on persons apparently in good health. Screening interventions are designed to identify disease in a community early, thus enabling earlier intervention and management in the hope to reduce mortality and suffering from a disease. Although screening may lead to an earlier diagnosis, not all screening tests have been shown to benefit the person being screened; overdiagnosis, misdiagnosis, and creating a false sense of security are some potential adverse effects of screening. For these reasons, a test used in a screening program, especially for a disease with low incidence, must have good sensitivity in addition to acceptable specificity. Several types of screening exist: universal screening involves screening of all individuals in a certain category. Case finding involves screening a smaller group of people based on the presence of risk factors. Screening interventions are not designed to be diagnostic. (via Freebase)