PHAR4823 Lecture Notes - Lecture 3: Positive And Negative Predictive Values, False Positive Rate, Polskie Radio Program Iii
23 Jul 2018
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Document Summary
Examples of health promotion programs based on theory. Screening is the systematic application of a test process to people who have not previously sought medical attention for a disorder, to identify individuals at sufficient risk of the disorder to warrant further investigation. Laboratory or point of care tests e. g. blood glucose, cholesterol. Approaches to screening: population-based - attempt to screen everybody, selective screening - targets groups at high risk in the community, opportunistic case detection - screening individuals during routine encounters with the health care system. The natural history of the disease is understood. There is an identifiable pre-clinical stage of the disease. The benefits of treatment after early detection are better than those obtained if treatment is delayed. The screening will be a systematic ongoing process. Probability that an affected individual has the disease. Formula a/a+c d/b+d or 1-false positive rate b/b+d or 1-specificity a/a+b. Comparison of bgl test for diabetes against gtt (the gold standard)
