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8 Cards in this Set
- Front
- Back
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Pre-Test probability
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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 |
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The gold standard
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- definition of the diseased state, used for comparison with a new test"
- often invasive and expensive - assumed to be correct |
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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! |
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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 |
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Positive Predictive Value
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- "the likelihood that a pt who test positive truly has the disease"
- TP/TP + FP |
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Negative predictive value
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- the likelihood that a patient who tests negative does NOT have the disease
- TN/TN + FN |
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Post Test Probability
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- the probability of a disease being present in a specific pt after performing a test
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Likelihood Ratios
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- 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 |
