Chapter 29: QA

Question 1

sensitivity

Answer 1

ability of a test to detect disease

Question 2

calculation for sensitivity

Answer 2

of true positive tests / # of all positive diagnoses

A / A+C

Question 3

Specificity

Answer 3

ability of a test to identify normalcy

Question 4

calculation for specificity

Answer 4

of true negatives / # of all negative diagnoses

D / D+B

Question 5

Positive predictive value (PPV)

Answer 5

how often is a positive study correct

Question 6

PPV equation

Answer 6

# of true positive tests / # of all positive noninvasive studies
true positives + false positives 

A / A+B

Question 7

Negative predictive value (NPV)

Answer 7

how often a negative study is correct

Question 8

NPV equation

Answer 8

# of true negative tests / # of all negative noninvasive studies
True negatives + false negatives 
D / C+D

Question 9

Accuracy

Answer 9

how good a test is

Question 10

accuracy equation

Answer 10

total # of correct tests / total # of all studies

A+D / A+B+C+D