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8 Cards in this Set

  • Front
  • Back
Pre-Test probability
Consider the following=
- history and PE
- risk factors
- clinical experience
- knowledge of disease
- 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
TP/(TP + FN)
- the likelihood of a positive test result in pts with known disease
- negative result from a highly sensitive test= Rule out!
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