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Flashcards in laboratory tests Deck (9):
1

What are the 4 major types of lab testing?

-diagnostic
-monitoring
-screening
-lifestyle/other (insurance company)

2

Sensitivity=

TP/(TP+FN)

-the probability that a test will be positive when the disease is present.

3

Specificity=

TN/(TN+FP)

-probability that a test result will be negative when disease is not present

4

Positive Predictive Value (PPV)=

TP/(TP+FP)

-probability that a positive test result is associated with presence of disease

5

NPV=

TN/(TN+FN)

-Probability that a negative test result is associated with absence of disease.

6

Precision vs. accuracy

probability that repeating the test yields the same result

vs

how close yo are to the 'real' answer

7

Diagnostic tests (high prevalence due to physician selection):

What specificity do we aim for?

>95%

8

Screening tests (low prevalence of condition):

what sensitivity do we aim for?

Want HIGH sensitivity to avoid FN, at cost of low specificity.

9

Positive Likelihood Ratio (LR)=

Negative Likelihood Ratio (LR)=

sensitivity/ (1- specificity)


(1-sensitivity)/specificity