Screening Tests

Question 1

State 4 of the Wilson Junger criteria for a screeing programme

Answer 1

Important health problem
Natural course must be known
A latent or early symptomatic stage of the condition must exist
Treatment must be more effective if commenced early
Test must be acceptable to the population
A test for the condition must exist

Question 2

What is meant by sensitivity?

Answer 2

Correctly identified true positives

The chance of testing positive in those with the disease

Question 3

What type of error do false negatives represent?

Answer 3

2

Question 4

What is meant by specificity?

Answer 4

Correctly identified true negatives

The chance of testing negative among those without the condition

Question 5

What type of error do false positives represent?

Answer 5

1

Question 6

What is meant by positive predictive value (PPV)?

Answer 6

The chance of having the condition among those that test positive

Question 7

What is meant by negative predictive value (NPV)

Answer 7

The chance of not having the condition among those that test negative