DIFFERENTIAL DIAGNOSIS AND PRIMARY CARE NR 511 MIDTERM EXAM / NR511 MIDTERM EXAM COMPLETE REAL EXAM QUESTIONS AND CORRECT DETAILED ANSWERS WITH RATIONALES (CORRECT VERIFIED SOLUTIONS) LATEST UPDATES |GUARANTEED PASS A+!!DIFFERENTIAL DIAGNOSIS AN
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DIFFERENTIAL DIAGNOSIS AND PRIMARY CARE NR 511
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DIFFERENTIAL DIAGNOSIS AND PRIMARY CARE NR 511
DIFFERENTIAL DIAGNOSIS AND PRIMARY CARE NR 511 MIDTERM EXAM / NR511 MIDTERM EXAM COMPLETE REAL EXAM QUESTIONS AND CORRECT DETAILED ANSWERS WITH RATIONALES (CORRECT VERIFIED SOLUTIONS) LATEST UPDATES |GUARANTEED PASS A+!!
DIFFERENTIAL DIAGNOSIS AND PRIMARY CARE NR 511 MIDTERM
EXAM / NR511 MIDTERM EXAM 2024-2025 COMPLETE REAL EXAM
QUESTIONS AND CORRECT DETAILED ANSWERS WITH
RATIONALES (CORRECT VERIFIED SOLUTIONS) LATEST UPDATES
|GUARANTEED PASS A+!!
What is the sensitivity of the Prostate Specific Antigen (PSA) for
detecting prostate cancer?
# men with prostate cancer
# men with positive PSA
160
# men with negative PSA
40
total
200
The correct answer is 160/200. Sensitivity is the proportion of patients
with the disease that have a positive result; it is the number of true
positives divided by the total number of patients who have the disease.
,A diagnostic test is used in a sample of 1000 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 negative. What is the
specificity of the test?
The correct answer is 470/500.
Rationale: Specificity is the proportion 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 negatives. In this example, 500/1000
patients have the disease. Of those 500 patients without the disease,
30 test positive, and 470 test negative.
The Positive Predictive Value (PPV) of a test refers to which of the
following?
Answer- the proportion of patients with a positive test who have the
disease.
Which of the following depends on the prevalence of the disease?
Answer- positive predictive value.
,Rationale: Predictive values depend on the prevalence of disease in the
population whereas sensitivity and specificity are intrinsic properties of
the test. Reliability refers to the consistency or stability of a measure.
A low pretest probability of disease may lead to which of the following?
Answer- low positive predictive value and more false-positive results.
Rationale: Positive predictive value increases with prevalence;
therefore, a low prevalence value yields a low positive predictive value
and implies a high false-positive rate. Negative predictive value
decreases with prevalence, and sensitivity and specificity do not vary
with prevalence.
If you strongly suspect that a patient is positive for a specific condition
but tests negative, the negative result may be:
Answer- false-negative test results due to a low negative predictive
value.
Rationale: At the individual level, your clinical suspicion is equivalent to
pre-test probability and high prevalence at the population level.
Negative predictive value is inversely correlated with prevalence;
therefore, your clinical suspicion translates to a low negative predictive
value, suggesting a false-negative test result.
, Which test(s) provide data relevant to the chief complaint: Fever
Answer- CBC
Rationale: Check CBC with differential for neutrophil shift in suspected
infection
Which test(s) provide data relevant to the chief complaint: Unexplained
bruising
Answer- CBC
Check platelet count
Which test(s) provide data relevant to the chief complaint: Fatigue
Answer- Both CBC and CMP
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