,NSG 550 Diagnostic Reasoning Exam 3 Wilkes
University Study Guide Clinical Reasoning +
Q&A + Rationales 2026/2027
1. A nurse practitioner enters a patient's room and within seconds determines that the patient
appears acutely ill and requires immediate intervention. This rapid assessment best exemplifies
which type of clinical reasoning process according to the dual-process model?
A. Type 2 analytical reasoning involving systematic data collection
B. Type 1 intuitive reasoning that is rapid and pattern-based
C. Bayesian reasoning that incorporates pre-test probability
D. Hypothetico-deductive reasoning with sequential hypothesis testing
Correct Answer: B. Type 1 intuitive reasoning that is rapid and pattern-based
Rationale: Type 1 (intuitive) reasoning is rapid, subconscious, and pattern-based; recognizing
"sick vs. not sick" within seconds of entering a patient's room is a hallmark of intuitive
processing. Options A, C, and D involve deliberate, analytical (Type 2) reasoning.
2. A 45-year-old patient presents with epigastric pain, and the nurse practitioner generates a
differential diagnosis that includes GERD, peptic ulcer disease, biliary colic, and cardiac
ischemia. This list of potential diagnoses is best described as which of the following?
A. Working diagnosis based on the most likely condition
B. Anatomical differential organized by organ system
C. Exhaustive differential including all reasonable possibilities
,D. Pathophysiologic cascade of disease progression
Correct Answer: C. Exhaustive differential including all reasonable possibilities
Rationale: An exhaustive differential includes all reasonable possibilities before narrowing to the
most likely diagnosis; the working diagnosis is the most likely after reasoning, and an anatomical
differential organizes by organ system.
3. The sensitivity of a diagnostic test refers to its ability to accomplish which of the following
clinical objectives?
A. Correctly identify those without the disease (true negative rate)
B. Correctly identify those with the disease (true positive rate)
C. Produce the same result on repeated testing (reliability)
D. Predict the probability of disease after a positive result
Correct Answer: B. Correctly identify those with the disease (true positive rate)
Rationale: Sensitivity = True Positives / (True Positives + False Negatives); high sensitivity rules
out disease when negative (SnNout). Specificity (option A) is the true negative rate and rules in
disease when positive (SpPin).
, 4. A 55-year-old man with a 45-pack-year smoking history presents with progressive dyspnea
and chronic productive cough. Spirometry shows FEV₁/FVC 0.55 and FEV₁ 45% predicted. What
is the severity classification of his COPD?
A. Mild (GOLD 1)
B. Moderate (GOLD 2)
C. Severe (GOLD 3)
D. Very severe (GOLD 4)
Correct Answer: C. Severe (GOLD 3)
Rationale: GOLD classification: GOLD 1 (mild) FEV₁ ≥80%; GOLD 2 (moderate) FEV₁ 50–79%;
GOLD 3 (severe) FEV₁ 30–49%; GOLD 4 (very severe) FEV₁ <30%. An FEV₁ of 45% predicted
indicates severe COPD.
5. A nurse practitioner is evaluating a patient with suspected pulmonary embolism. The patient
has a Wells score of 5.5. What is the most appropriate next step?
A. Order a D-dimer to rule out PE
B. Proceed directly to CT pulmonary angiogram
C. Start anticoagulation without confirmation
D. Order a chest X-ray only
Correct Answer: B. Proceed directly to CT pulmonary angiogram
University Study Guide Clinical Reasoning +
Q&A + Rationales 2026/2027
1. A nurse practitioner enters a patient's room and within seconds determines that the patient
appears acutely ill and requires immediate intervention. This rapid assessment best exemplifies
which type of clinical reasoning process according to the dual-process model?
A. Type 2 analytical reasoning involving systematic data collection
B. Type 1 intuitive reasoning that is rapid and pattern-based
C. Bayesian reasoning that incorporates pre-test probability
D. Hypothetico-deductive reasoning with sequential hypothesis testing
Correct Answer: B. Type 1 intuitive reasoning that is rapid and pattern-based
Rationale: Type 1 (intuitive) reasoning is rapid, subconscious, and pattern-based; recognizing
"sick vs. not sick" within seconds of entering a patient's room is a hallmark of intuitive
processing. Options A, C, and D involve deliberate, analytical (Type 2) reasoning.
2. A 45-year-old patient presents with epigastric pain, and the nurse practitioner generates a
differential diagnosis that includes GERD, peptic ulcer disease, biliary colic, and cardiac
ischemia. This list of potential diagnoses is best described as which of the following?
A. Working diagnosis based on the most likely condition
B. Anatomical differential organized by organ system
C. Exhaustive differential including all reasonable possibilities
,D. Pathophysiologic cascade of disease progression
Correct Answer: C. Exhaustive differential including all reasonable possibilities
Rationale: An exhaustive differential includes all reasonable possibilities before narrowing to the
most likely diagnosis; the working diagnosis is the most likely after reasoning, and an anatomical
differential organizes by organ system.
3. The sensitivity of a diagnostic test refers to its ability to accomplish which of the following
clinical objectives?
A. Correctly identify those without the disease (true negative rate)
B. Correctly identify those with the disease (true positive rate)
C. Produce the same result on repeated testing (reliability)
D. Predict the probability of disease after a positive result
Correct Answer: B. Correctly identify those with the disease (true positive rate)
Rationale: Sensitivity = True Positives / (True Positives + False Negatives); high sensitivity rules
out disease when negative (SnNout). Specificity (option A) is the true negative rate and rules in
disease when positive (SpPin).
, 4. A 55-year-old man with a 45-pack-year smoking history presents with progressive dyspnea
and chronic productive cough. Spirometry shows FEV₁/FVC 0.55 and FEV₁ 45% predicted. What
is the severity classification of his COPD?
A. Mild (GOLD 1)
B. Moderate (GOLD 2)
C. Severe (GOLD 3)
D. Very severe (GOLD 4)
Correct Answer: C. Severe (GOLD 3)
Rationale: GOLD classification: GOLD 1 (mild) FEV₁ ≥80%; GOLD 2 (moderate) FEV₁ 50–79%;
GOLD 3 (severe) FEV₁ 30–49%; GOLD 4 (very severe) FEV₁ <30%. An FEV₁ of 45% predicted
indicates severe COPD.
5. A nurse practitioner is evaluating a patient with suspected pulmonary embolism. The patient
has a Wells score of 5.5. What is the most appropriate next step?
A. Order a D-dimer to rule out PE
B. Proceed directly to CT pulmonary angiogram
C. Start anticoagulation without confirmation
D. Order a chest X-ray only
Correct Answer: B. Proceed directly to CT pulmonary angiogram
