NR 511 Differential Diagnosis
and Primary Care Midterm |
Exam Review | Questions and
Answers 100% Pass | Graded
A+
Administrator
[COMPANY NAME] [Company address]
,1. what is the sensitivity of the Prostate
# men with
Specific Antigen (PSA) for detecting prostate
prostate cancer
cancer?
# men with
positive PSA
160
# men with
negative PSA
40
tot
al
200
The correct answer
is 160/200.
Sensitivity is the
proportion of pa-
tients with the
disease that have a
positive re- sult; it
is the number
of true positives
divid- ed by the
total number of
patients who have
2. A diagnostic test is used in a sample of 1000
the disease.
patients. 500 of these patients have the
disease, while 500 do not. Of those 500 patients
without the disease, 30 test positive, and 470
test nega- tive. What is the specificity of the The correct
test? answer is 470/500.
Specificity is the
pro- portion of
patients who test
negative out of
the total number
of patients who
,do not have the disease; it is the number of
true
negatives overall neg- atives. In this ex- ample,
500/1000 pa- tients have the disease.
, Of those 500
patients without the
disease, 30 test
positive, and 470
test negative.
3. The Positive Predictive Value (PPV) of a test
refers to which of the following? the proportion of
pa- tients with a
positive test who
have the dis- ease.
4. Which of the following depends on the
preva- lence of the disease? positive predictive
val- ue.
Predictive values
de- pend on the
prevalence of
disease in the pop-
ulation whereas
sen- sitivity and
specificity are
intrinsic properties
of the test.
Reliability refers to
5. A low pretest probability of disease may lead the consisten- cy or
to which of the following? stability of a mea-
sure.
low positive
predic- tive value
and more false-
positive results.
Positive predictive
val- ue increases
with prevalence;
therefore, a low
prevalence val- ue
yields a low pos-
itive predictive val-
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller StarScoreGrades. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $14.99. You're not tied to anything after your purchase.
