EPID 309 - Quiz Questions & Answers
(Final Exam)
A rapid screening test for syphilis antibodies was performed on a 19 year old, sexually
active patient who presented with acute abdominal pain. The antibody test was reactive,
suggesting the presence of syphilis. Further testing, however, using a more [invasive
but] definitive procedure was negative syphilis.
The clinic performed an evaluation of the validity of the rapid screening test by
comparing it with the definitive [aka gold standard]: 50 of the rapid screening tests were
reactive and 450 were not reactive. Of the 50 reactive tests, 30 were subsequently
determined by the definitive procedure to be positive. However, 50 of the 450 negative
screening results were determined to be positive by the definitive procedure.
What is the specificity of this screening test? - answer95.2%
A new screening test is developed which has a greater specificity that the previous "gold
standard" test for breast cancer among women. If nothing else changes, - answerthe
negative predictive value will also go up, because more of the individuals without
abnormal cells will receive a negative test results even though the number of false
negatives doesn't change
A new screening test is developed which has a greater sensitivity than the previous
"gold standard" test for breast cancer among women. If nothing else changes, -
answerthe PPV should increase because more of the people with the disease (true
positives) will be correctly identified, thus more of the positive tests will actually be
positive individuals
A new screening tool is better able to identify people without the disease. This test likely
has higher _____ than the previously used tool. - answerSpecificity
A rapid screening test for syphilis antibodies was performed on a 19 year old, sexually
active patient who presented with acute abdominal pain. The antibody test was reactive,
suggesting the presence of syphilis. Further testing, however, using a more [invasive
but] definitive procedure was negative syphilis.
The clinic performed an evaluation of the validity of the rapid screening test by
comparing it with the definitive [aka gold standard]: 50 of the rapid screening tests were
reactive and 450 were not reactive. Of the 50 reactive tests, 30 were subsequently
determined by the definitive procedure to be positive. However, 50 of the 450 negative
screening results were determined to be positive by the definitive procedure.
(Final Exam)
A rapid screening test for syphilis antibodies was performed on a 19 year old, sexually
active patient who presented with acute abdominal pain. The antibody test was reactive,
suggesting the presence of syphilis. Further testing, however, using a more [invasive
but] definitive procedure was negative syphilis.
The clinic performed an evaluation of the validity of the rapid screening test by
comparing it with the definitive [aka gold standard]: 50 of the rapid screening tests were
reactive and 450 were not reactive. Of the 50 reactive tests, 30 were subsequently
determined by the definitive procedure to be positive. However, 50 of the 450 negative
screening results were determined to be positive by the definitive procedure.
What is the specificity of this screening test? - answer95.2%
A new screening test is developed which has a greater specificity that the previous "gold
standard" test for breast cancer among women. If nothing else changes, - answerthe
negative predictive value will also go up, because more of the individuals without
abnormal cells will receive a negative test results even though the number of false
negatives doesn't change
A new screening test is developed which has a greater sensitivity than the previous
"gold standard" test for breast cancer among women. If nothing else changes, -
answerthe PPV should increase because more of the people with the disease (true
positives) will be correctly identified, thus more of the positive tests will actually be
positive individuals
A new screening tool is better able to identify people without the disease. This test likely
has higher _____ than the previously used tool. - answerSpecificity
A rapid screening test for syphilis antibodies was performed on a 19 year old, sexually
active patient who presented with acute abdominal pain. The antibody test was reactive,
suggesting the presence of syphilis. Further testing, however, using a more [invasive
but] definitive procedure was negative syphilis.
The clinic performed an evaluation of the validity of the rapid screening test by
comparing it with the definitive [aka gold standard]: 50 of the rapid screening tests were
reactive and 450 were not reactive. Of the 50 reactive tests, 30 were subsequently
determined by the definitive procedure to be positive. However, 50 of the 450 negative
screening results were determined to be positive by the definitive procedure.
