Diagnostic And Screening Tests: Validity And Reliability

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Book Chapter

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Epidemiology for the Advanced Practice Nurse: A Population Health Approach


Testing consists of screening and diagnostic testing. Both screening and diagnostic testing are secondary prevention measures. The actual test used for screening and diagnostic testing is often the same. However, the differentiation is the context and purpose for which the test is conducted. Screening and diagnostic testing are essential components of surveillance systems. Screening is the presumptive identification of an unrecognized disease or health condition in a population by the application of a test, examination, or other procedure. This chapter differentiates between screening and diagnostic testing. It helps the reader calculate sensitivity and specificity rate. The chapter calculates positive predictive value and negative predictive value measures; and differentiates the types of reliability measures.

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Epidemiology For The Advanced Practice Nurse: A Population Health Approach