QA multiple choice

In vascular testing, what is typically considered to be the gold standard?

a. computed tomography

b. magnetic resonance imaging

c. angiography

d. duplex ultrasound

c. angiography

What is the identification of a 50% to 79% stenosis of the internal carotid artery and a 60% stenosis by angiography an example of?

a. true positive

b. true negative

c. false positive

d. false negative

a. true positive

Upon ultrasound evaluation, DVT is found in the popliteal vein; however, venography demonstrates a widely patent vessel. What is this an example of?

a. true positive

b. true negative

c. false positive

d. false negative

c. false positive

During duplex assessment of the abdominal aorta, the aorta measures less than 2.0 cm, which is confirmed by angiography. What is this an example of?

a. true positive

b. true negative

c. false positive

d. false negative

b. true negative

Duplex evaluation of the superior mesenteric artery demonstrated velocities of 150 cm/s. Angiography demonstrated a 70% stenosis in the same vessel. What is this an example of?

a. true positive

b. true negative

c. false positive

d. false negative

d. false negative

Which of the following is NOT likely to occur if false-positive results are indicated by the duplex ultrasound examination?

a. unnecessary treatment

b. lack of treatment when treatment is needed

c. unnecessary stress to the patient

d. repeat examinations

b. lack of treatment when treatment is needed

Which of the following would have the highest accuracy?

a. 25 true positives and 30 true negatives out of 100 examinations

b. 20 true positives and 10 true negatives out of 100 examinations

c. 50 true positives and 5 true negatives out of 100 examinations

d. 10 true positives and 75 true negatives out of 100 examinations

d. 10 true positives and 75 true negatives out of 100 examinations

An increase in which of the following results would increase the sensitivity of an examination?

a. false positive

b. false negative

c. true positive

d. true negative

c. true positives

Which results are needed to improve specificity?

a. true negatives

b. true positives

c. false negatives

d. false positives

a. true negatives

What is the consistency of obtaining similar results under similar circumstances?

a. accuracy

b. sensitivity

c. reliability

d. specificity

c. reliability

Which of the following would an increase in the number of false-positive results have an impact on?

a. positive predictive value and negative predictive value

b. positive predictive value and specificity

c. negative predictive value and sensitivity

d. positive predictive value and sensitivity

b. positive predictive value and specificity

After statistical analysis, a test was found to have a sensitivity of 92% and a specificity of 84%. Which of the following could represent the overall accuracy?

a. 95%

b. 82%

c. 89%

d. cannot be determined

c. 89%

If a test has a negative predictive value of 50%, how sure can you be that your test results are negative?

a. extremely

b. moderately

c. equivocal

d. not sure at all

c. equivocal

In general, if the sensitivity of a test increases, what will happen to the specificity of the test?

a. increases

b. decreases

c. remains the same

d. cannot be determined

b. decreases

Which of the following parameters would an increase in the number of false-negative results impact?

a. negative predictive value and sensitivity

b. positive predicative value and sensitivity

c. sensitivity and specificity

d. negative predictive value and specificity

a. negative predictive value and sensitivity