Lab

Question 1

Accuracy

Answer 1

How closely the test results correspond to the “gold standard.”

Question 2

Precision

Answer 2

How reproducible the results are with repeat testing of the same specimen.

Question 3

Sensitivity

Answer 3

Used to RULE OUT disease. It is sensitive enough for me to say you don’t have it. % of people without disease, with negative results.

Question 4

Specificity

Answer 4

Used to RULE IN. Specific enough I can say you for sure have it.

Question 5

Likelihood Ratio

Answer 5

How likely the test is to be useful.

Question 6

LR >1

Answer 6

Indicates test result is associated with disease

Question 7

LR <1

Answer 7

Indicates test result is associated with ABSENCE of the disease.

Question 8

Predictive Value

Answer 8

Estimation of probability of presence or absence of disease.

Question 9

Positive PV

Answer 9

% of persons with positive terse result who have the disease

Question 10

Negative PV

Answer 10

% of person with negative test who do not have the disease.

Question 11

Pre-test probability

Answer 11

Prevalence of a disease in a given population

Question 12

Post test probability

Answer 12

proportion of patients testing positive who truly have the disease (Positive PV)