Critical Appraisal: Appraising a Diagnostic Test: D-Dimer

Exam Summary

0 of 4 Questions completed

Questions:

You have already completed the exam before. Hence you can not start it again.

Exam is loading...

You must sign in or sign up to start the exam.

You must first complete the following:

Results

Exam complete. Results are being recorded.

Results

Your time:

You will need to meet or exceed the 80% pass mark to obtain a certificate. Save the module to log it in your CPD Diary.

Current
Review
Answered
Correct
Incorrect

Question 1 of 4

1. Question
Which of the following statements about the design of studies that evaluate diagnostic tests are correct?
- A confounding variable is a variable that is associated with both the outcome and the intervention
- Bias can be detected by looking at the statistics
- A randomised controlled trial is most commonly used to evaluate a test
- As no intervention is evaluated, the role of competing interests is diminished
- Blinding is important in studies evaluating diagnostic tests
Question 2 of 4

2. Question
Which of the following statements about studies evaluating a diagnostic test are correct?
- Losses to follow-up often causes confounding in cohort studies
- Spectrum bias results when a group of subjects who clearly have the condition or clearly do not are selected
- Expectation bias exists when the observers are completely blinded to the results of the tests they are applying
- Work-up bias exists when more of one group (testing negative or positive) got the gold standard than the other group
- A validation study looks to see whether the findings from a derivation study apply in another group of patients
Question 3 of 4

3. Question
Which of the following statements about analysing a study evaluating a diagnostic test are correct?
- A sensitive test is good at picking up people who have the condition, compared to the gold standard
- A specific test is good at excluding people who do not have the condition, compared to the gold standard
- The sensitivity and specificity of a test usually vary in different patient groups
- A negative predictive value is the same as the post-test probability of a negative result
- A test with a high positive predictive value is one that rules out most of the cases who do not have the disease
Question 4 of 4

4. Question
Which of the following statements about the applicability of a study evaluating a diagnostic test are correct?
- Internal validity refers to how well the study findings can be applied elsewhere
- You should apply the findings from a study only if it has been validated in your own population
- The confidence interval width is important
- If a study has high internal validity then the results can be applied elsewhere
- If a trial has high external validity then the results can be applied elsewhere

3 Comments

Collapse Comments

hanifa4725 October 7, 2018 at 7:42 pm

very useful module

jayakumarpo February 4, 2019 at 7:20 pm

Excellent on line learning

jayakumarpo February 4, 2019 at 7:21 pm

it is useful to evaluate daily practice.

Critical Appraisal: Appraising a Diagnostic Test: D-Dimer – Post Test

Exam Summary

Information

Results

Results

Categories

1. Question

2. Question

3. Question

4. Question

Leave a Comment Cancel reply