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Flashcards in Sensitivity and Specificity Deck (12)
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1
Q

a diagnostic test that is positive in the presence of disease

A

true positive

2
Q

a diagnostic test that is negative in the absence of disease

A

true negative

3
Q

a diagnostic test that is positive but no pathogen or disease is present

A

false positive

4
Q

a diagnostic test that is negative but the pathogen or disease is present

A

false negative

5
Q

what is the proportion of people who truly have the disease and are identified by a specific positive test

A

sensitivity

6
Q

what is the proportion of people who do not have the disease and are identified by having a specific negative test

A

specificity

7
Q

how is sensitivity calculated

A

number of true positives / total number of patients WITH disease or pathogen

8
Q

how is specificity calculated

A

number of true negatives / total number of patients WITHOUT disease or pathogen

9
Q

if a highly sensitive test is negative, what does this mean

A

we can exclude the organism tested from DX

rule out of the disease

(SNout) sensitivity rules out

10
Q

sensitive tests are useful for what

A

screening out disease

(SNout) sensitivity rules out dz

11
Q

if a highly specific test is positive, what does this mean

A

we can confirm or rule in disease form DX

(SPin) specificity rules in dz

12
Q

specific test are useful for what

A

confirming disease

(SPin) specificity rules in dz