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### 8 Cards in this Set

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 Pre-Test probability Consider the following= - history and PE - risk factors - clinical experience - knowledge of disease PREVALENCE = PRE TEST PROB!! - Percentage of pts who have the disease at one fiven time The gold standard - definition of the diseased state, used for comparison with a new test" - often invasive and expensive - assumed to be correct Sensitivity TP/(TP + FN) - the likelihood of a positive test result in pts with known disease - negative result from a highly sensitive test= Rule out! Specificity TN/(TN + FP) - liklihood of a negative test result in pts without the disease - postivite result from a highly specific test helps Rule in Positive Predictive Value - "the likelihood that a pt who test positive truly has the disease" - TP/TP + FP Negative predictive value - the likelihood that a patient who tests negative does NOT have the disease - TN/TN + FN Post Test Probability - the probability of a disease being present in a specific pt after performing a test Likelihood Ratios - analogous to predictive values but intrinsic - a positive result for a test with high LR+ of 5 to 10 is strong evidence for a pt having the disease - negative result for a test with low LR- of .1 to .5 is strong evidence against disease