Deck 4: Evidence-Based Laboratory Medicine

Question 1

During diagnostic accuracy studies in evidence-based laboratory medicine,a laboratory test being studied,for example,produces results that are compared with the gold standard of testing,which would be the currently used assay or assay system.The test of interest is referred to as a(n):

A) index test.
B) reference standard.
C) outcome study.
D) practice test.

Answer 1

index test.

Question 2

In a study of diagnostic accuracy,the selection of the study groups was not random and included only a few individuals in each group.This would likely affect which one of the following?

A) Internal validity
B) External validity
C) The clinical reference standard
D) Index test

Answer 2

External validity

Question 3

In a randomized control trial,the use of a new vaccine was observed to reduce the number Chlamydia trachomatis infections in a population of college-aged women.This finding is referred to as a(n):

A) clinical audit.
B) systematic review.
C) patient outcome.
D) internal validator.

Answer 3

patient outcome.

Question 4

Another way that "bias" can be defined is as _____ error.

A) random
B) systematic
C) analytical
D) clinical

Question 5

QALY:

A) is associated with a quality systematic review of literature.
B) assesses the quality of a diagnostic accuracy study.
C) is an outcome achieved in cost-utility analysis.
D) relates to the implementation of the findings of a clinical audit.

Question 6

STARD:

A) relates to the four components of economic evaluation in an evidence-based laboratory medicine study.
B) is the assessment of the value of a test analysis for those individuals who are tested.
C) is a set of guidelines assembled to put into practice the findings of an evidence-based laboratory medicine study.
D) includes a listing of items that need to be included in reports of studies on diagnostic accuracy.

Question 7

Systematic reviews are used to assess and answer very specific clinical questions in an unbiased way.The most important of the steps in conducting a systematic review is the:

A) formulation of the clinical question that will form the basis of the review.
B) choosing of the reviewer who will perform the work.
C) primary literature search and review.
D) data extraction from the literature.

Question 8

When developing clinical practice guidelines,what is the critical first step?

A) Requesting input from health insurance companies and government officials
B) Preparing a cost analysis based on patient needs
C) Determining the intended group that will be directly involved with implementation
D) Selecting and refining the topic upon which the investigation will center

Question 9

In reading a research article,you determine that the study design was flawed because there was no control group.This is an example of a weakness in:

A) internal reliability.
B) internal validity.
C) external reliability.
D) external validity.

Question 10

A research study was prepared to assess the diagnostic accuracy of a therapeutic drug monitoring assay for HMG-CoA reductase inhibitors (statins).The study was flawed with poor design.Which of the following statements are correct?

A) Random error decreased.
B) Systematic error decreased.
C) Systematic error increased.
D) Both a and b are correct.

Question 11

In a research study,a physician asks if the results from the therapeutic drug assay will be able to predict the patient's eventual health outcome.A study to determine this is referred to as a:

A) patient outcome study.
B) case-control study.
C) systematic review.
D) prognostic value study.

Question 12

If the evidence overwhelmingly points toward the introduction of a new laboratory analysis and practice,yet physicians fail to incorporate the new test into their clinical practice,what component of evidence-based laboratory medicine will reveal this?

A) Clinical audit
B) Economic evaluation
C) Systematic review
D) Clinical practice guidelines

Question 13

Internal validity is the:

A) degree to which the variables in the study apply to all individuals in the study.
B) degree to which the results of your sample can be inferred to the general population outside of your study.
C) equivalent of consistency.
D) calculation of mean and variance from repeated measures.

Question 14

Following a systematic review,random control studies,clinical audit,and a cost evaluation,an assay for assessment of growth hormone level as a predictor of bone cancer has been recommended to be performed in your chemistry laboratory.What might be an issue if the group recommending this assay was composed of all oncologists?

A) This group would likely not have the expertise needed to suggest implementation and develop a guideline.
B) This specialty group of physicians might be motivated to implement this test to produce income for the group practice.
C) The systematic review,research studies,and statistical analysis would be beyond the scope of this group of physicians.
D) There is nothing inappropriate about this group because they are experts in the field.

Question 15

Following a systematic review,random control studies,clinical audit,and a cost evaluation,an assay for assessment of growth hormone level as a predictor of bone cancer has been recommended by a group of orthopedic surgeons to be performed in your chemistry laboratory.What is the next step before implementation of the assay?

A) Evaluating the costs of alternative methods to produce similar outcomes
B) Developing a clinical practice guideline for implementation of the assay
C) Performing a meta-analysis
D) Beginning a second round of randomized control trials