title: Decision analysis: dealing with uncertainty in diagnostic testing.
abstract: Decision analysis is a process for systematically analyzing complex choices by considering all pertinent information. In this paper, we discuss how uncertainty associated with diagnostic testing can be included in a decision analysis using pay-off tables and decision trees (decision-flow diagrams). Variables associated with diagnostic test interpretation (such as pre-test and post-test probability of disease; test sensitivity, specificity and predictive values; fixed cut-offs versus continuous measurement scales; test dependence associated with the use of multiple tests) are considered. Several decision criteria and output measures are discussed (including MAXIMIN and MAXIMAX criteria, opportunity costs, expected monetary values, expected utility, sensitivity and risk-profile analysis, and threshold analysis). The application of decision analysis to diagnostic testing for Johne's disease and traumatic reticuloperitonitis of cattle, and for canine heartworm disease are used to illustrate both population- and patient-oriented applications and criteria for ranking the desirability of different outcomes.
authors.affiliation: Division of Epidemiology and Preventive Medicine, College of Veterinary Medicine, University of Illinois, Urbana 61802, USA. rd-smith@uiuc.edu
authors.forename: R D
authors.initials: RD
authors.lastname: Smith
authors.forename: B D
authors.initials: BD
authors.lastname: Slenning
mesh_terms: D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000175:diagnosis; D003661:Decision Support Techniques; D003937:Diagnosis, Differential; D003955:Diagnostic Tests, Routine / Q000662:veterinary*; D004184:Dirofilariasis / Q000175:diagnosis; D004283:Dog Diseases / Q000175:diagnosis; D004285:Dogs; D004797:Enzyme-Linked Immunosorbent Assay; D010283:Paratuberculosis / Q000175:diagnosis; D010538:Peritonitis / Q000175:diagnosis / Q000662:veterinary; D015995:Prevalence; D011336:Probability; D012680:Sensitivity and Specificity; D014730:Veterinary Medicine