NR 511: Differential Diagnosis and Primary
Care
Midterm Examination – Weeks 1–4
Chamberlain University | 2026/2027
125 Questions with Expert Rationales
Instructions
• This examination covers content from Weeks 1–4, including clinical decision-making,
diagnostic reasoning, health promotion, and common conditions seen in primary
care.
• Select the single best answer for each question.
• Rationales provide evidence-based explanations for each correct answer.
Section 1: Clinical Decision-Making and Diagnostic Reasoning
(Questions 1-25)
1. A 45-year-old patient presents with a chief complaint of "chest pain." Which
of the following is the MOST appropriate initial step in clinical reasoning?
A. Order a chest X-ray immediately
B. Perform a focused physical examination
C. Generate a differential diagnosis based on the history
D. Prescribe nitroglycerin sublingually
Answer: C
Expert Rationale: The clinical reasoning process begins with gathering a
thorough history, which guides the differential diagnosis. Generating a differential
,diagnosis based on the history is the initial step before ordering tests, performing a
focused exam, or initiating treatment.
2. The NP is using the clinical reasoning process to evaluate a patient with
abdominal pain. Which of the following represents the correct order of steps?
A. Hypothesis generation → Data collection → Data interpretation → Problem
identification → Management
B. Data collection → Hypothesis generation → Data interpretation → Problem
identification → Management
C. Data collection → Data interpretation → Hypothesis generation → Problem
identification → Management
D. Hypothesis generation → Data interpretation → Data collection → Problem
identification → Management
Answer: B
Expert Rationale: The clinical reasoning process begins with data collection
(history, physical exam). This leads to hypothesis generation (developing a
differential diagnosis), followed by data interpretation, problem identification, and
finally management.
3. A 32-year-old female presents with fatigue, weight gain, and cold
intolerance. Which of the following is the MOST likely diagnosis based on the
presentation?
A. Hyperthyroidism
B. Hypothyroidism
C. Anemia
D. Depression
Answer: B
Expert Rationale: Hypothyroidism classically presents with fatigue, weight gain,
cold intolerance, constipation, and bradycardia. This presentation is highly suggestive
of hypothyroidism, which should be confirmed with TSH testing.
4. The NP is evaluating a patient with a chief complaint of headache. Which of
the following historical features would be a "red flag" requiring immediate
further evaluation?
A. Throbbing unilateral headache lasting 4 hours
B. Gradual onset headache over 3 days
C. Sudden onset "thunderclap" headache
D. Headache associated with stress
Answer: C
Expert Rationale: A sudden onset "thunderclap" headache is a red flag that may
,indicate subarachnoid hemorrhage, sentinel bleed, or other serious intracranial
pathology. This requires immediate evaluation, including neuroimaging.
5. Which of the following is an example of a "pathognomonic" sign?
A. Fever in a patient with pneumonia
B. Koplik spots in measles
C. Headache in migraine
D. Chest pain in myocardial infarction
Answer: B
Expert Rationale: Pathognomonic signs are those that are uniquely characteristic
of a specific disease. Koplik spots (small white spots on the buccal mucosa) are
pathognomonic for measles (rubeola).
6. A 58-year-old male with a history of hypertension and diabetes presents with
new-onset chest pressure with exertion that resolves with rest. This description
is MOST consistent with:
A. Stable angina
B. Unstable angina
C. Myocardial infarction
D. Pericarditis
Answer: A
Expert Rationale: Stable angina is characterized by chest discomfort that occurs
with exertion or stress and resolves with rest or nitroglycerin. Unstable angina occurs
at rest or with minimal exertion and is increasing in frequency or severity.
7. The NP understands that the "pretest probability" of a disease is influenced
by which of the following factors?
A. Prevalence of the disease in the population
B. Patient's age and gender
C. Clinical presentation
D. All of the above
Answer: D
Expert Rationale: Pretest probability is influenced by disease prevalence, patient
demographics (age, gender, race), clinical presentation, and risk factors. This
probability guides diagnostic testing and interpretation.
8. Which of the following best describes the "sensitivity" of a diagnostic test?
A. The ability of a test to correctly identify those without the disease
B. The ability of a test to correctly identify those with the disease
C. The probability that a positive test correctly identifies disease
D. The probability that a negative test correctly rules out disease
, Answer: B
Expert Rationale: Sensitivity is the proportion of patients with the disease who
test positive (true positive rate). A highly sensitive test is useful for ruling out disease
(SnNOut: high Sensitivity, Negative result rules out).
9. A diagnostic test has a sensitivity of 95% and a specificity of 90%. What is the
meaning of the 90% specificity?
A. 90% of patients with the disease will test positive
B. 90% of patients without the disease will test negative
C. 90% of positive tests are true positives
D. 90% of negative tests are true negatives
Answer: B
Expert Rationale: Specificity is the proportion of patients without the disease
who test negative (true negative rate). A highly specific test is useful for ruling in
disease (SpPIn: high Specificity, Positive result rules in).
10. The NP is considering ordering a D-dimer test for a patient with suspected
deep vein thrombosis. The D-dimer has high sensitivity but low specificity. A
negative D-dimer is useful to:
A. Rule in DVT
B. Rule out DVT
C. Confirm pulmonary embolism
D. Diagnose thrombophilia
Answer: B
Expert Rationale: D-dimer has high sensitivity (95-98%) but low specificity. A
negative D-dimer in a low-risk patient effectively rules out DVT (SnNOut: high
Sensitivity, Negative result rules out). A positive D-dimer is not diagnostic and
requires confirmatory imaging.
11. A 28-year-old female presents with dysuria and urinary frequency. The NP
considers ordering a urinalysis. This test would be considered:
A. Screening
B. Diagnostic
C. Confirmatory
D. Prognostic
Answer: B
Expert Rationale: A urinalysis in this context is a diagnostic test used to confirm
the clinical suspicion of urinary tract infection by identifying leukocytes, nitrites, and
bacteria.
Care
Midterm Examination – Weeks 1–4
Chamberlain University | 2026/2027
125 Questions with Expert Rationales
Instructions
• This examination covers content from Weeks 1–4, including clinical decision-making,
diagnostic reasoning, health promotion, and common conditions seen in primary
care.
• Select the single best answer for each question.
• Rationales provide evidence-based explanations for each correct answer.
Section 1: Clinical Decision-Making and Diagnostic Reasoning
(Questions 1-25)
1. A 45-year-old patient presents with a chief complaint of "chest pain." Which
of the following is the MOST appropriate initial step in clinical reasoning?
A. Order a chest X-ray immediately
B. Perform a focused physical examination
C. Generate a differential diagnosis based on the history
D. Prescribe nitroglycerin sublingually
Answer: C
Expert Rationale: The clinical reasoning process begins with gathering a
thorough history, which guides the differential diagnosis. Generating a differential
,diagnosis based on the history is the initial step before ordering tests, performing a
focused exam, or initiating treatment.
2. The NP is using the clinical reasoning process to evaluate a patient with
abdominal pain. Which of the following represents the correct order of steps?
A. Hypothesis generation → Data collection → Data interpretation → Problem
identification → Management
B. Data collection → Hypothesis generation → Data interpretation → Problem
identification → Management
C. Data collection → Data interpretation → Hypothesis generation → Problem
identification → Management
D. Hypothesis generation → Data interpretation → Data collection → Problem
identification → Management
Answer: B
Expert Rationale: The clinical reasoning process begins with data collection
(history, physical exam). This leads to hypothesis generation (developing a
differential diagnosis), followed by data interpretation, problem identification, and
finally management.
3. A 32-year-old female presents with fatigue, weight gain, and cold
intolerance. Which of the following is the MOST likely diagnosis based on the
presentation?
A. Hyperthyroidism
B. Hypothyroidism
C. Anemia
D. Depression
Answer: B
Expert Rationale: Hypothyroidism classically presents with fatigue, weight gain,
cold intolerance, constipation, and bradycardia. This presentation is highly suggestive
of hypothyroidism, which should be confirmed with TSH testing.
4. The NP is evaluating a patient with a chief complaint of headache. Which of
the following historical features would be a "red flag" requiring immediate
further evaluation?
A. Throbbing unilateral headache lasting 4 hours
B. Gradual onset headache over 3 days
C. Sudden onset "thunderclap" headache
D. Headache associated with stress
Answer: C
Expert Rationale: A sudden onset "thunderclap" headache is a red flag that may
,indicate subarachnoid hemorrhage, sentinel bleed, or other serious intracranial
pathology. This requires immediate evaluation, including neuroimaging.
5. Which of the following is an example of a "pathognomonic" sign?
A. Fever in a patient with pneumonia
B. Koplik spots in measles
C. Headache in migraine
D. Chest pain in myocardial infarction
Answer: B
Expert Rationale: Pathognomonic signs are those that are uniquely characteristic
of a specific disease. Koplik spots (small white spots on the buccal mucosa) are
pathognomonic for measles (rubeola).
6. A 58-year-old male with a history of hypertension and diabetes presents with
new-onset chest pressure with exertion that resolves with rest. This description
is MOST consistent with:
A. Stable angina
B. Unstable angina
C. Myocardial infarction
D. Pericarditis
Answer: A
Expert Rationale: Stable angina is characterized by chest discomfort that occurs
with exertion or stress and resolves with rest or nitroglycerin. Unstable angina occurs
at rest or with minimal exertion and is increasing in frequency or severity.
7. The NP understands that the "pretest probability" of a disease is influenced
by which of the following factors?
A. Prevalence of the disease in the population
B. Patient's age and gender
C. Clinical presentation
D. All of the above
Answer: D
Expert Rationale: Pretest probability is influenced by disease prevalence, patient
demographics (age, gender, race), clinical presentation, and risk factors. This
probability guides diagnostic testing and interpretation.
8. Which of the following best describes the "sensitivity" of a diagnostic test?
A. The ability of a test to correctly identify those without the disease
B. The ability of a test to correctly identify those with the disease
C. The probability that a positive test correctly identifies disease
D. The probability that a negative test correctly rules out disease
, Answer: B
Expert Rationale: Sensitivity is the proportion of patients with the disease who
test positive (true positive rate). A highly sensitive test is useful for ruling out disease
(SnNOut: high Sensitivity, Negative result rules out).
9. A diagnostic test has a sensitivity of 95% and a specificity of 90%. What is the
meaning of the 90% specificity?
A. 90% of patients with the disease will test positive
B. 90% of patients without the disease will test negative
C. 90% of positive tests are true positives
D. 90% of negative tests are true negatives
Answer: B
Expert Rationale: Specificity is the proportion of patients without the disease
who test negative (true negative rate). A highly specific test is useful for ruling in
disease (SpPIn: high Specificity, Positive result rules in).
10. The NP is considering ordering a D-dimer test for a patient with suspected
deep vein thrombosis. The D-dimer has high sensitivity but low specificity. A
negative D-dimer is useful to:
A. Rule in DVT
B. Rule out DVT
C. Confirm pulmonary embolism
D. Diagnose thrombophilia
Answer: B
Expert Rationale: D-dimer has high sensitivity (95-98%) but low specificity. A
negative D-dimer in a low-risk patient effectively rules out DVT (SnNOut: high
Sensitivity, Negative result rules out). A positive D-dimer is not diagnostic and
requires confirmatory imaging.
11. A 28-year-old female presents with dysuria and urinary frequency. The NP
considers ordering a urinalysis. This test would be considered:
A. Screening
B. Diagnostic
C. Confirmatory
D. Prognostic
Answer: B
Expert Rationale: A urinalysis in this context is a diagnostic test used to confirm
the clinical suspicion of urinary tract infection by identifying leukocytes, nitrites, and
bacteria.
