NSG 550 Diagnostic Reasoning for Nurse
Practitioners: 100 Original Practice
Questions and Answers with Rationales for
Exams 1, 2, and 3 Covering Foundations,
Diagnostic Testing, Urologic, Renal,
Endocrine, Immunologic, Skeletal,
Pulmonary, Cardiovascular, Neurologic,
Gastrointestinal, and Multisystem
Disorders Comprehensive 2026/2027 Study
Exam 1: Foundations, Diagnostic
Reasoning, Testing, Urologic/Renal (1–34)
1. Q: What is anchoring bias?
A: Fixating on the first diagnosis.
R: It can lead to premature closure and
missed alternative diagnoses.
,2. Q: What does sensitivity measure?
A: The proportion of people with disease
who test positive.
R: Highly sensitive tests are useful for
ruling out disease when negative —
“SnNout.”
3. Q: What does specificity measure?
A: The proportion of people without
disease who test negative.
R: Highly specific tests are useful for
ruling in disease when positive —
“SpPin.”
4. Q: What is positive predictive value
(PPV)?
A: The probability that disease is present
when the test is positive.
, R: PPV depends heavily on disease
prevalence.
5. Q: What is negative predictive value
(NPV)?
A: The probability that disease is absent
when the test is negative.
R: NPV also depends on prevalence.
6. Q: What does a positive likelihood
ratio greater than 10 mean?
A: It strongly rules in disease.
R: Large likelihood ratios substantially
increase post-test probability.
7. Q: What does a negative likelihood
ratio less than 0.1 mean?
A: It strongly rules out disease.
R: Very low negative likelihood ratios
, substantially decrease post-test
probability.
8. Q: What is confirmation bias?
A: Seeking only evidence that supports
the initial impression.
R: It leads to ignored contradictory
findings.
9. Q: What is availability bias?
A: Overestimating a diagnosis because it
was recently seen.
R: Recent experience can distort
probability judgment.
10. Q: What is base rate neglect?
A: Ignoring the prevalence of disease
when interpreting a test.
R: Even accurate tests can mislead when
disease is rare.
Practitioners: 100 Original Practice
Questions and Answers with Rationales for
Exams 1, 2, and 3 Covering Foundations,
Diagnostic Testing, Urologic, Renal,
Endocrine, Immunologic, Skeletal,
Pulmonary, Cardiovascular, Neurologic,
Gastrointestinal, and Multisystem
Disorders Comprehensive 2026/2027 Study
Exam 1: Foundations, Diagnostic
Reasoning, Testing, Urologic/Renal (1–34)
1. Q: What is anchoring bias?
A: Fixating on the first diagnosis.
R: It can lead to premature closure and
missed alternative diagnoses.
,2. Q: What does sensitivity measure?
A: The proportion of people with disease
who test positive.
R: Highly sensitive tests are useful for
ruling out disease when negative —
“SnNout.”
3. Q: What does specificity measure?
A: The proportion of people without
disease who test negative.
R: Highly specific tests are useful for
ruling in disease when positive —
“SpPin.”
4. Q: What is positive predictive value
(PPV)?
A: The probability that disease is present
when the test is positive.
, R: PPV depends heavily on disease
prevalence.
5. Q: What is negative predictive value
(NPV)?
A: The probability that disease is absent
when the test is negative.
R: NPV also depends on prevalence.
6. Q: What does a positive likelihood
ratio greater than 10 mean?
A: It strongly rules in disease.
R: Large likelihood ratios substantially
increase post-test probability.
7. Q: What does a negative likelihood
ratio less than 0.1 mean?
A: It strongly rules out disease.
R: Very low negative likelihood ratios
, substantially decrease post-test
probability.
8. Q: What is confirmation bias?
A: Seeking only evidence that supports
the initial impression.
R: It leads to ignored contradictory
findings.
9. Q: What is availability bias?
A: Overestimating a diagnosis because it
was recently seen.
R: Recent experience can distort
probability judgment.
10. Q: What is base rate neglect?
A: Ignoring the prevalence of disease
when interpreting a test.
R: Even accurate tests can mislead when
disease is rare.
