Screenings in Medicine (Segars)

Question 1

__=Test is positive and patient has the disease. Which box?

Answer 1

True positive

Box A

Question 2

__=Test is positive but pt does not have the disease. Which box?

Answer 2

False positive

Box B

Question 3

__=Test is negative and pt does not have disease. Which box?

Answer 3

True negative

Box D

Question 4

__=Test is negative but pt does have disease. Which box?

Answer 4

False negative

Box C

Question 5

__=Describes accuracy of test result (based on known disease status)

Answer 5

Sensitivity and Specificity

Question 6

__=Predicts accuracy of Dx (based on known test result)

Answer 6

PPV and NPV

Question 7

__=Describes collective accuracy of all correct test results (from total study pop.)

Answer 7

Diagnostic accuracy

Question 8

Equation for Sensitivity?

Answer 8

Sensitivity=TP / (TP + FN) x 100%
OR
Sensitivity= A / (A + C) x 100%

Question 9

Equation for Specificity?

Answer 9

Specificity=TN / (TN + FP) x 100%
OR
Sensitivity=D/ (B + D) x 100%

Question 10

A highly sensitive test has a low __ rate

A highly specific test has a low __ rate

Answer 10

FN

FP

Question 11

Equation for PPV?

Answer 11

PPV=TP / (TP + FP) x 100%
OR
PPV= A / (A + B) x 100%

Question 12

Equation for NPV?

Answer 12

NPV=TN / (TN + FN) x 100%
OR
NPV=D / (D + C) x 100%

Question 13

Equation for diagnostic accuracy?

Answer 13

DA=(TP + TN) / (TP+FP+FN+TN) x 100%
OR
DA=(A + D) / (A+B+C+D) x 100%

Question 14

LR + should be __ to demonstrate test is most beneficial

LR- should be __ to demonstrate test is most beneficial

Answer 14

> 10

<0.1