,NR511 Week 4 Midterm Exam – Complete Practice Questions
1–100 with Verified Answers and Detailed Rationales
Chamberlain University | NR 511 Differential Diagnosis &
Primary Care Practicum | Weeks 1–4 | 2025/2026
SECTION 1: DIAGNOSTIC REASONING & CLINICAL METHODOLOGY (Questions 1–20)
1. What is the definition of diagnostic reasoning?
A. The ability to memorize medical facts
B. Reflective thinking that questions one's thinking to determine if all possible avenues have been
explored
C. The process of coding medical diagnoses
D. The documentation of patient history
Correct Answer: B
Rationale: Diagnostic reasoning is a form of critical thinking where the clinician questions their own
thought process to avoid premature closure and ensure all possibilities are considered.
2. What is the first step in the diagnostic reasoning process?
A. Order diagnostic tests
B. Develop a differential diagnosis
C. Gather data (history and physical examination)
D. Initiate treatment
Correct Answer: C
Rationale: The clinical reasoning process begins with gathering data through a thorough history and
physical examination. This data forms the foundation for generating differential diagnoses, ordering
tests, and developing a treatment plan.
3. The purpose of a differential diagnosis is to:
A. Confirm a single diagnosis immediately
B. Systematically consider all possible conditions that could explain the patient's presentation
C. Select the most expensive diagnostic test
D. Document the patient's history only
Correct Answer: B
Rationale: Differential diagnosis is a systematic method of identifying all potential conditions that could
account for a patient's symptoms and signs. It ensures important diagnoses are not missed and guides
further evaluation.
,4. Which of the following best describes the clinical utility of a likelihood ratio (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: A likelihood ratio positive (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.
5. A diagnostic test has very few false negatives. What is the best way to describe this test?
A. High specificity
B. Low specificity
C. High sensitivity
D. Low sensitivity
Correct Answer: C
Rationale: Sensitivity is the ability to correctly identify those with the disease. A high-sensitivity test
yields very few false negatives, making it excellent for "ruling out" disease (SNOUT).
6. A screening test correctly identifies 80 individuals who do not have colon cancer out of 100
individuals who are disease-free (true negatives). The test fails to recognize 20 individuals who do not
have colon cancer. What is the specificity of the screening test?
A. 20%
B. 80%
C. 100%
D. 60%
Correct Answer: B
Rationale: Specificity is the ability of a test to correctly identify those without the condition (True
Negatives / Total Without Disease). Here, = 80%. High specificity helps "rule in" a disease
(SPIN).
7. What does the "A" in SNAPPS stand for?
A. Assessment
B. Analyze
C. Action
D. Assess
, Correct Answer: B
Rationale: The SNAPPS mnemonic stands for: Summarize, Narrow, Analyze, Probe, Plan, Select. The "A"
stands for Analyze, not Assessment.
8. Which mnemonic is used for organizing the History of Present Illness (HPI)?
A. SNAPPS
B. OLDCARTS
C. SOAP
D. PQRST
Correct Answer: B
Rationale: OLDCARTS (Onset, Location, Duration, Characteristics, Aggravating factors, Relieving factors,
Treatments, Severity) is the standard framework for gathering subjective data in the HPI.
9. You strongly suspect a patient has a specific condition, but the test result is negative. This negative
result may be attributed to:
A. High positive predictive value
B. High specificity
C. A false-negative result due to low negative predictive value
D. A true negative
Correct Answer: C
Rationale: If your clinical suspicion (pre-test probability) is high, the negative predictive value (NPV)
decreases. This means a negative result is more likely to be a false negative.
10. What is the key difference between medical coding and medical billing?
A. Coding is for hospitals; billing is for clinics.
B. Coding uses codes to communicate with payers about procedures; billing is the process of submitting
and following up on claims.
C. There is no difference between the two.
D. Coding is done by physicians; billing is done by nurses.
Correct Answer: B
Rationale: Medical coding translates clinical documentation into standardized codes (CPT, ICD-10) for
communication with payers. Medical billing is the process of submitting claims and following up on
reimbursement.
11. A 42-year-old woman presents with fatigue and intermittent abdominal discomfort. You ask her to
describe when the discomfort started, what makes it better or worse, and how long each episode
lasts. Which part of diagnostic reasoning are you actively gathering?
A. Functional health patterns
1–100 with Verified Answers and Detailed Rationales
Chamberlain University | NR 511 Differential Diagnosis &
Primary Care Practicum | Weeks 1–4 | 2025/2026
SECTION 1: DIAGNOSTIC REASONING & CLINICAL METHODOLOGY (Questions 1–20)
1. What is the definition of diagnostic reasoning?
A. The ability to memorize medical facts
B. Reflective thinking that questions one's thinking to determine if all possible avenues have been
explored
C. The process of coding medical diagnoses
D. The documentation of patient history
Correct Answer: B
Rationale: Diagnostic reasoning is a form of critical thinking where the clinician questions their own
thought process to avoid premature closure and ensure all possibilities are considered.
2. What is the first step in the diagnostic reasoning process?
A. Order diagnostic tests
B. Develop a differential diagnosis
C. Gather data (history and physical examination)
D. Initiate treatment
Correct Answer: C
Rationale: The clinical reasoning process begins with gathering data through a thorough history and
physical examination. This data forms the foundation for generating differential diagnoses, ordering
tests, and developing a treatment plan.
3. The purpose of a differential diagnosis is to:
A. Confirm a single diagnosis immediately
B. Systematically consider all possible conditions that could explain the patient's presentation
C. Select the most expensive diagnostic test
D. Document the patient's history only
Correct Answer: B
Rationale: Differential diagnosis is a systematic method of identifying all potential conditions that could
account for a patient's symptoms and signs. It ensures important diagnoses are not missed and guides
further evaluation.
,4. Which of the following best describes the clinical utility of a likelihood ratio (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: A likelihood ratio positive (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.
5. A diagnostic test has very few false negatives. What is the best way to describe this test?
A. High specificity
B. Low specificity
C. High sensitivity
D. Low sensitivity
Correct Answer: C
Rationale: Sensitivity is the ability to correctly identify those with the disease. A high-sensitivity test
yields very few false negatives, making it excellent for "ruling out" disease (SNOUT).
6. A screening test correctly identifies 80 individuals who do not have colon cancer out of 100
individuals who are disease-free (true negatives). The test fails to recognize 20 individuals who do not
have colon cancer. What is the specificity of the screening test?
A. 20%
B. 80%
C. 100%
D. 60%
Correct Answer: B
Rationale: Specificity is the ability of a test to correctly identify those without the condition (True
Negatives / Total Without Disease). Here, = 80%. High specificity helps "rule in" a disease
(SPIN).
7. What does the "A" in SNAPPS stand for?
A. Assessment
B. Analyze
C. Action
D. Assess
, Correct Answer: B
Rationale: The SNAPPS mnemonic stands for: Summarize, Narrow, Analyze, Probe, Plan, Select. The "A"
stands for Analyze, not Assessment.
8. Which mnemonic is used for organizing the History of Present Illness (HPI)?
A. SNAPPS
B. OLDCARTS
C. SOAP
D. PQRST
Correct Answer: B
Rationale: OLDCARTS (Onset, Location, Duration, Characteristics, Aggravating factors, Relieving factors,
Treatments, Severity) is the standard framework for gathering subjective data in the HPI.
9. You strongly suspect a patient has a specific condition, but the test result is negative. This negative
result may be attributed to:
A. High positive predictive value
B. High specificity
C. A false-negative result due to low negative predictive value
D. A true negative
Correct Answer: C
Rationale: If your clinical suspicion (pre-test probability) is high, the negative predictive value (NPV)
decreases. This means a negative result is more likely to be a false negative.
10. What is the key difference between medical coding and medical billing?
A. Coding is for hospitals; billing is for clinics.
B. Coding uses codes to communicate with payers about procedures; billing is the process of submitting
and following up on claims.
C. There is no difference between the two.
D. Coding is done by physicians; billing is done by nurses.
Correct Answer: B
Rationale: Medical coding translates clinical documentation into standardized codes (CPT, ICD-10) for
communication with payers. Medical billing is the process of submitting claims and following up on
reimbursement.
11. A 42-year-old woman presents with fatigue and intermittent abdominal discomfort. You ask her to
describe when the discomfort started, what makes it better or worse, and how long each episode
lasts. Which part of diagnostic reasoning are you actively gathering?
A. Functional health patterns
