Week 4

Question 1

If a diagnosis test has high sensitivity, what does that mean?

Answer 1

it has few false negatives

Question 2

True or False:

– NPV is the likelihood of not having a disease when a test is negative?

Answer 2

True

Question 3

What tells you how likely a test result is to be found?

Answer 3

likelihood ratio

Question 4

A highly specific test is effective in ruling conditions “in” or “out” and why?

Answer 4

in, because it has few false positives

Question 5

True or False:

– If a patient is very unlikely or very likely to have a disorder, there is probably no need for test?

Answer 5

True

Question 6

What is the probability that a person WITH disorder will have a positive test result?

Answer 6

Sensitivity

Question 7

What is the probability that a person WITHOUT disorder will have a negative test result?

Answer 7

Specificity

Question 8

Ability of a Dx test to identify true disease without missing anyone who has it?

Answer 8

sensitivity

Question 9

Ability of a Dx test to identify absence of disease without mislabeling anyone who does not have it?

Answer 9

specificity

Question 10

What type of test has few false negatives so it is effective at ruling conditions “out”?

Answer 10

SnNout (sensitivity)

Question 11

What type of test has few false positives so it is effective at ruling conditions “in”?

Answer 11

SpPin (specificity)

Question 12

Existing cases of a disorder in a population at one point in time?

Answer 12

prevalence

Question 13

The likelihood of having the Dx when the test is positive?

Answer 13

Positive Predictive Value (PPV)

Question 14

The likelihood of not having the Dx when the test is negative?

Answer 14

Negative Predictive Value (NPV)

Question 15

A LR > 10 is good for ruling the condition….

Answer 15

IN

Question 16

A LR < 0.1 is good for ruling the condition….

Answer 16

OUT