Flashcards in laboratory tests Deck (9):
What are the 4 major types of lab testing?
-lifestyle/other (insurance company)
-the probability that a test will be positive when the disease is present.
-probability that a test result will be negative when disease is not present
Positive Predictive Value (PPV)=
-probability that a positive test result is associated with presence of disease
-Probability that a negative test result is associated with absence of disease.
Precision vs. accuracy
probability that repeating the test yields the same result
how close yo are to the 'real' answer
Diagnostic tests (high prevalence due to physician selection):
What specificity do we aim for?
Screening tests (low prevalence of condition):
what sensitivity do we aim for?
Want HIGH sensitivity to avoid FN, at cost of low specificity.