NR 511 Midterm Exam / NR511 Midterm Exam (5
Versions): Differential Diagnosis and Primary Care
Practicum: Chamberlain College of Nursing(NEW-
2020/2021)
SECTION 1: Clinical Reasoning, Diagnostic Process & Evidence-Based Practice (Questions 1–22)
Question 1
A diagnostic test has a sensitivity of 95% for a serious condition. A patient tests negative. Which
interpretation is most accurate?
A. The patient definitely does not have the condition
B. The condition is highly unlikely given the high sensitivity (SnNout)
C. The test should be repeated because sensitivity below 100% is unreliable
D. Specificity is more important than sensitivity for ruling out disease
Correct Answer: B
Rationale: A highly sensitive test means that 95% of people with the disease will test
positive. Therefore, a negative result on a highly sensitive test effectively rules out the disease
(SnNout: Sensitive, Negative, rules OUT). Specificity is used to rule IN disease (SpPin), not rule it
out .
Question 2
A nurse practitioner is evaluating a 45-year-old woman with a positive mammogram. The test
has a sensitivity of 85% and specificity of 90%. The prevalence of breast cancer in this age group
is approximately 1%. Which statement about positive predictive value (PPV) is most accurate?
A. PPV increases as disease prevalence increases in the population tested
B. PPV is independent of disease prevalence and depends only on test characteristics
C. PPV in this scenario would be approximately 85% given the high sensitivity
D. PPV is calculated by dividing true negatives by all negative results
Correct Answer: A
Rationale: Positive predictive value is directly influenced by disease prevalence. Even with a
test that has 85% sensitivity and 90% specificity, when prevalence is only 1%, the PPV will be
,relatively low (approximately 7.9%) because most positive results will be false positives. As
prevalence increases, true positives increase relative to false positives, raising the PPV .
Question 3
Which of the following best describes the clinical utility of a likelihood ratio positive (LR+) of 12?
A. The test result moderately increases the probability of disease
B. The test result strongly increases the probability of disease
C. The test result has no meaningful effect on disease probability
D. The test result strongly decreases the probability of disease
Correct Answer: B
Rationale: An LR+ greater than 10 is considered strong evidence to rule IN a disease. An LR+
of 12 means that a positive test result is 12 times more likely in a patient with the disease
compared to a patient without the disease. LR+ between 5–10 is moderate, and LR− less than
0.1 is strong for ruling out disease .
Question 4
A 32-year-old patient presents with acute onset of pleuritic chest pain, dyspnea, and
tachycardia following a long-haul flight. The nurse practitioner calculates a Wells score of 4.5.
What is the most appropriate next step in diagnostic management?
A. Obtain a chest X-ray as the best initial test for pulmonary embolism
B. Order a D-dimer because the Wells score is below the threshold for imaging
C. Proceed directly to CT pulmonary angiography given the high clinical probability
D. Prescribe anticoagulation and observe for 24 hours before further testing
Correct Answer: C
Rationale: A Wells score of 4.5 indicates high clinical probability for pulmonary embolism
(score greater than 4 is high). In high-probability patients, the next step is to proceed directly to
CT pulmonary angiography (CTPA), which is the gold standard imaging study. D-dimer is most
useful in low- to moderate-probability patients to rule out PE, as a negative D-dimer effectively
excludes PE in low-risk patients .
Question 5
A clinician continually asks whether any key diagnoses are being overlooked and whether each
lab ordered truly adds value. This process best describes which concept?
,A. SOAP documentation
B. Diagnostic reasoning
C. Medical decision making
D. Differential diagnosis
Correct Answer: B
Rationale: Diagnostic reasoning is a reflective, critical-thinking process where the clinician
questions their own thinking to ensure all possibilities are explored and conclusions are
evidence-based. It is the foundation of clinical judgment .
Question 6
What is the first step in the diagnostic reasoning process?
A. Physical examination
B. History of present illness (HPI)
C. Ordering diagnostic tests
D. Formulating a differential diagnosis
Correct Answer: B
Rationale: The HPI is the first step in the diagnostic reasoning process, using the OLDCARTS
mnemonic to gather detailed information about the chief complaint. This foundational data
drives hypothesis generation and subsequent testing decisions .
Question 7
A diagnostic test has very few false negatives. How is this test best described?
A. High specificity
B. Low specificity
C. High sensitivity
D. Low sensitivity
Correct Answer: C
Rationale: A highly sensitive test correctly identifies most people who have the condition,
resulting in very few false negatives. This makes it a good test to help rule out a disease when
negative (SnNout) .
, Question 8
The mnemonic "OLDCARTS" is used to assess which of the following?
A. Past medical history
B. Family history
C. History of present illness
D. Review of systems
Correct Answer: C
Rationale: OLDCARTS (Onset, Location, Duration, Character, Aggravating factors, Relieving
factors, Timing, Severity) is a systematic approach to gathering detailed information about the
patient's chief complaint and is a core component of the HPI .
Question 9
Which of the following represents subjective data?
A. Blood pressure reading of 130/85 mmHg
B. Patient's complaint of "sharp chest pain that started 2 hours ago"
C. Laboratory result showing elevated white blood cell count
D. Tenderness noted on palpation of the abdomen
Correct Answer: B
Rationale: Subjective data is anything the patient tells you or complains of, including the
chief complaint, HPI, and review of systems. Objective data is what you can see, touch, hear, or
smell during your exam, including lab and diagnostic test results .
Question 10 (SATA)
Which of the following are components of evidence-based clinical decision-making? (Select all
that apply.)
A. Evidence-based research
B. Clinical practice guidelines
C. Provider experience alone
D. Published evidence-based algorithms
E. Patient preference exclusively
Correct Answer: A, B, D
Rationale: Sound clinical decisions require integration of evidence-based research, clinical
Versions): Differential Diagnosis and Primary Care
Practicum: Chamberlain College of Nursing(NEW-
2020/2021)
SECTION 1: Clinical Reasoning, Diagnostic Process & Evidence-Based Practice (Questions 1–22)
Question 1
A diagnostic test has a sensitivity of 95% for a serious condition. A patient tests negative. Which
interpretation is most accurate?
A. The patient definitely does not have the condition
B. The condition is highly unlikely given the high sensitivity (SnNout)
C. The test should be repeated because sensitivity below 100% is unreliable
D. Specificity is more important than sensitivity for ruling out disease
Correct Answer: B
Rationale: A highly sensitive test means that 95% of people with the disease will test
positive. Therefore, a negative result on a highly sensitive test effectively rules out the disease
(SnNout: Sensitive, Negative, rules OUT). Specificity is used to rule IN disease (SpPin), not rule it
out .
Question 2
A nurse practitioner is evaluating a 45-year-old woman with a positive mammogram. The test
has a sensitivity of 85% and specificity of 90%. The prevalence of breast cancer in this age group
is approximately 1%. Which statement about positive predictive value (PPV) is most accurate?
A. PPV increases as disease prevalence increases in the population tested
B. PPV is independent of disease prevalence and depends only on test characteristics
C. PPV in this scenario would be approximately 85% given the high sensitivity
D. PPV is calculated by dividing true negatives by all negative results
Correct Answer: A
Rationale: Positive predictive value is directly influenced by disease prevalence. Even with a
test that has 85% sensitivity and 90% specificity, when prevalence is only 1%, the PPV will be
,relatively low (approximately 7.9%) because most positive results will be false positives. As
prevalence increases, true positives increase relative to false positives, raising the PPV .
Question 3
Which of the following best describes the clinical utility of a likelihood ratio positive (LR+) of 12?
A. The test result moderately increases the probability of disease
B. The test result strongly increases the probability of disease
C. The test result has no meaningful effect on disease probability
D. The test result strongly decreases the probability of disease
Correct Answer: B
Rationale: An LR+ greater than 10 is considered strong evidence to rule IN a disease. An LR+
of 12 means that a positive test result is 12 times more likely in a patient with the disease
compared to a patient without the disease. LR+ between 5–10 is moderate, and LR− less than
0.1 is strong for ruling out disease .
Question 4
A 32-year-old patient presents with acute onset of pleuritic chest pain, dyspnea, and
tachycardia following a long-haul flight. The nurse practitioner calculates a Wells score of 4.5.
What is the most appropriate next step in diagnostic management?
A. Obtain a chest X-ray as the best initial test for pulmonary embolism
B. Order a D-dimer because the Wells score is below the threshold for imaging
C. Proceed directly to CT pulmonary angiography given the high clinical probability
D. Prescribe anticoagulation and observe for 24 hours before further testing
Correct Answer: C
Rationale: A Wells score of 4.5 indicates high clinical probability for pulmonary embolism
(score greater than 4 is high). In high-probability patients, the next step is to proceed directly to
CT pulmonary angiography (CTPA), which is the gold standard imaging study. D-dimer is most
useful in low- to moderate-probability patients to rule out PE, as a negative D-dimer effectively
excludes PE in low-risk patients .
Question 5
A clinician continually asks whether any key diagnoses are being overlooked and whether each
lab ordered truly adds value. This process best describes which concept?
,A. SOAP documentation
B. Diagnostic reasoning
C. Medical decision making
D. Differential diagnosis
Correct Answer: B
Rationale: Diagnostic reasoning is a reflective, critical-thinking process where the clinician
questions their own thinking to ensure all possibilities are explored and conclusions are
evidence-based. It is the foundation of clinical judgment .
Question 6
What is the first step in the diagnostic reasoning process?
A. Physical examination
B. History of present illness (HPI)
C. Ordering diagnostic tests
D. Formulating a differential diagnosis
Correct Answer: B
Rationale: The HPI is the first step in the diagnostic reasoning process, using the OLDCARTS
mnemonic to gather detailed information about the chief complaint. This foundational data
drives hypothesis generation and subsequent testing decisions .
Question 7
A diagnostic test has very few false negatives. How is this test best described?
A. High specificity
B. Low specificity
C. High sensitivity
D. Low sensitivity
Correct Answer: C
Rationale: A highly sensitive test correctly identifies most people who have the condition,
resulting in very few false negatives. This makes it a good test to help rule out a disease when
negative (SnNout) .
, Question 8
The mnemonic "OLDCARTS" is used to assess which of the following?
A. Past medical history
B. Family history
C. History of present illness
D. Review of systems
Correct Answer: C
Rationale: OLDCARTS (Onset, Location, Duration, Character, Aggravating factors, Relieving
factors, Timing, Severity) is a systematic approach to gathering detailed information about the
patient's chief complaint and is a core component of the HPI .
Question 9
Which of the following represents subjective data?
A. Blood pressure reading of 130/85 mmHg
B. Patient's complaint of "sharp chest pain that started 2 hours ago"
C. Laboratory result showing elevated white blood cell count
D. Tenderness noted on palpation of the abdomen
Correct Answer: B
Rationale: Subjective data is anything the patient tells you or complains of, including the
chief complaint, HPI, and review of systems. Objective data is what you can see, touch, hear, or
smell during your exam, including lab and diagnostic test results .
Question 10 (SATA)
Which of the following are components of evidence-based clinical decision-making? (Select all
that apply.)
A. Evidence-based research
B. Clinical practice guidelines
C. Provider experience alone
D. Published evidence-based algorithms
E. Patient preference exclusively
Correct Answer: A, B, D
Rationale: Sound clinical decisions require integration of evidence-based research, clinical
