NR 569 MIDTERM EXAM 2026/2027 | Differential
Diagnosis in Acute Care Practicum Review |
Chamberlain
Section 1: Foundations of Diagnostic Reasoning and Clinical Decision-Making (Q1–Q15)
Q1. A 68-year-old male presents to the emergency department with acute onset chest pain. The
ACNP begins generating diagnostic hypotheses. Which approach best reflects the hypothesis-
driven method of diagnostic reasoning per 2026 guidelines?
A. Order a comprehensive metabolic panel and wait for results before forming any clinical
impression
B. Generate multiple competing diagnoses simultaneously based on the initial presentation,
then systematically rule them in or out
C. Rely solely on pattern recognition from previous similar patients to arrive at a single diagnosis
immediately
D. Refer the patient to a specialist before initiating any diagnostic workup given the complexity
Correct Answer: B
Rationale: The hypothesis-driven method involves generating multiple diagnostic
hypotheses early based on initial data, then systematically testing each through focused
assessment. This reduces cognitive bias and anchoring, which are leading causes of diagnostic
error in acute care. Option A delays clinical reasoning inappropriately. Option C describes
pattern recognition, which is prone to bias with atypical presentations. Option D defers
reasoning without initial assessment by the ACNP, which contradicts the scope of practice.
Q2. An ACNP is using the SNApps framework to present a clinical case to the preceptor. Which
of the following correctly describes the components of the SNApps method in the proper
sequence?
A. Summarize, Narrow, Analyze, Probe, Plan, Select
B. Subjective, Objective, Assess, Plan, Plan, Select
C. Subjective, Narrow, Analyze, Probe, Plan, Select
D. Summarize, Name, Assess, Probe, Plan, Select
Correct Answer: A
, Rationale: SNApps is a clinical reasoning framework for case presentation: Summarize the
relevant history and findings, Narrow the differential diagnosis to 2–3 conditions, Analyze the
differential by comparing and contrasting diagnoses, Probe the preceptor with questions about
uncertainties, Plan management with the preceptor, and Select a case-related issue for self-
directed learning. Option B incorrectly substitutes the SOAP note format. Options C and D
misidentify the first component as Subjective or Name rather than Summarize, demonstrating a
common framework confusion in the NR 569 curriculum.
Q3. In the NGN Clinical Judgment Measurement Model (CJMM), which action best represents
the "Analyze Cues" step when a 75-year-old presents with confusion, hypotension (BP 88/50),
and temperature 38.9°C?
A. Immediately administer broad-spectrum antibiotics and isotonic IV fluids
B. Recognize that the combination of altered mental status, hemodynamic instability, and fever
form a cluster suggesting sepsis
C. Prioritize which diagnosis is most likely before obtaining additional clinical data
D. Evaluate the patient response to initial fluid resuscitation after 30 minutes
Correct Answer: B
Rationale: The "Analyze Cues" step in the CJMM involves recognizing patterns and
clustering relevant clinical data to identify potential explanations. The combination of altered
mental status, hypotension, and fever is a classic sepsis cluster. Option A represents "Generate
Solutions" or "Take Action." Option C describes premature prioritization without adequate data
analysis. Option D represents "Evaluate Outcomes."
Q4. A 42-year-old female has 2 weeks of progressive fatigue, myalgias, and low-grade fevers.
She was diagnosed with viral syndrome 5 days ago but now presents with new petechiae on her
lower extremities and gum bleeding. Which red flag most significantly changes diagnostic
urgency?
A. Duration of symptoms extending beyond 10 days without improvement
B. New onset bleeding manifestations suggesting a potential hematologic emergency
C. Presence of myalgias which could indicate an autoimmune process
D. Low-grade fevers suggesting an undiagnosed infectious etiology requiring antibiotics
Correct Answer: B
, Rationale: New bleeding manifestations with progressive constitutional symptoms is a
critical red flag that dramatically shifts diagnostic urgency. This suggests thrombocytopenia with
bleeding risk, potentially indicating acute leukemia, aplastic anemia, DIC, or severe sepsis. The
2026 NCCN and ASH guidelines emphasize that new bleeding with systemic symptoms requires
immediate CBC with differential, coagulation studies, and peripheral smear. While duration,
myalgias, and fevers are concerning, they represent gradual progression rather than an acute
change signaling life-threatening pathology.
Q5. What is the fundamental principle for creating a differential diagnosis in acute care?
A. Always start with the rarest possible diagnosis to avoid missing anything
B. "Hoofbeats = Horses NOT Zebras" — common things occur commonly
C. Focus only on life-threatening conditions to the exclusion of all others
D. Include every possible diagnosis equally regardless of probability
Correct Answer: B
Rationale: The fundamental principle of differential diagnosis is that common conditions
occur commonly. While serious and life-threatening conditions must always be considered, the
most likely diagnosis should be based on prevalence and clinical probability. Option A is
impractical and leads to excessive testing. Option C risks anchoring bias and missing common
treatable conditions. Option D is inefficient and does not reflect clinical reasoning priorities.
Q6. A 55-year-old female presents with dyspnea. The Wells score estimates PE pre-test
probability at 15%. A D-dimer returns at 450 ng/mL (negative below 500). Using Bayesian
analysis, what is the most appropriate next step?
A. Discharge the patient since the negative D-dimer conclusively rules out PE
B. Proceed directly to CTPA because the pre-test probability is too high for D-dimer
C. Calculate post-test probability using the negative likelihood ratio to determine if PE is
excluded
D. Repeat the D-dimer in 24 hours to confirm the negative result before disposition
Correct Answer: C
Rationale: Bayesian analysis requires combining pre-test probability with test characteristics
(likelihood ratios) to determine post-test probability. The 2026 ACCP/ESC guidelines emphasize
that D-dimer interpretation must integrate clinical probability via validated scoring. A D-dimer
near the cutoff with moderate pre-test probability does not automatically exclude PE; the
, negative likelihood ratio must be applied. If post-test probability remains above the test
treatment threshold, further imaging is warranted. Simply discharging or reflexively imaging
both represent suboptimal diagnostic reasoning.
Q7. Which of the following best describes the concept of positive predictive value (PPV) in
diagnostic testing?
A. The probability that a patient with the disease has a positive test result
B. The probability that a patient with a negative test result does not have the disease
C. The probability that a patient with a positive test result actually has the disease
D. The proportion of all positive test results that are true positives in a population with high
disease prevalence
Correct Answer: C
Rationale: Positive predictive value (PPV) is defined as the probability that a patient with a
positive test result actually has the disease. Option A describes sensitivity. Option B describes
negative predictive value (NPV). Option D is a description of PPV in specific circumstances but
does not capture the full definition; PPV is markedly dependent on disease prevalence in the
population being tested.
Q8. A 65-year-old patient presents with acute dyspnea. The nurse practitioner estimates the
pretest probability of pulmonary embolism at 15%. A D-dimer assay is ordered and returns
negative. The D-dimer test used has a sensitivity of 95% and a specificity of 40% for PE. Which
principle best explains the clinical utility of this result?
A. A negative result on a highly sensitive test effectively rules out the disease (SnNout)
B. A positive result on a highly specific test effectively rules in the disease (SpPin)
C. The positive predictive value is more important than sensitivity in this scenario
D. The negative likelihood ratio of 0.15 means PE is still highly probable
Correct Answer: A
Rationale: The SnNout principle states that a negative result on a highly sensitive test
(sensitivity of 95% in this case) effectively rules out the disease because there are very few false
negatives. With a low pretest probability (15%) and a negative highly sensitive D-dimer, PE can
be safely excluded without further imaging. SpPin (option B) applies when using a positive result
on a highly specific test to confirm disease, which is not the scenario here. The PPV (option C)
Diagnosis in Acute Care Practicum Review |
Chamberlain
Section 1: Foundations of Diagnostic Reasoning and Clinical Decision-Making (Q1–Q15)
Q1. A 68-year-old male presents to the emergency department with acute onset chest pain. The
ACNP begins generating diagnostic hypotheses. Which approach best reflects the hypothesis-
driven method of diagnostic reasoning per 2026 guidelines?
A. Order a comprehensive metabolic panel and wait for results before forming any clinical
impression
B. Generate multiple competing diagnoses simultaneously based on the initial presentation,
then systematically rule them in or out
C. Rely solely on pattern recognition from previous similar patients to arrive at a single diagnosis
immediately
D. Refer the patient to a specialist before initiating any diagnostic workup given the complexity
Correct Answer: B
Rationale: The hypothesis-driven method involves generating multiple diagnostic
hypotheses early based on initial data, then systematically testing each through focused
assessment. This reduces cognitive bias and anchoring, which are leading causes of diagnostic
error in acute care. Option A delays clinical reasoning inappropriately. Option C describes
pattern recognition, which is prone to bias with atypical presentations. Option D defers
reasoning without initial assessment by the ACNP, which contradicts the scope of practice.
Q2. An ACNP is using the SNApps framework to present a clinical case to the preceptor. Which
of the following correctly describes the components of the SNApps method in the proper
sequence?
A. Summarize, Narrow, Analyze, Probe, Plan, Select
B. Subjective, Objective, Assess, Plan, Plan, Select
C. Subjective, Narrow, Analyze, Probe, Plan, Select
D. Summarize, Name, Assess, Probe, Plan, Select
Correct Answer: A
, Rationale: SNApps is a clinical reasoning framework for case presentation: Summarize the
relevant history and findings, Narrow the differential diagnosis to 2–3 conditions, Analyze the
differential by comparing and contrasting diagnoses, Probe the preceptor with questions about
uncertainties, Plan management with the preceptor, and Select a case-related issue for self-
directed learning. Option B incorrectly substitutes the SOAP note format. Options C and D
misidentify the first component as Subjective or Name rather than Summarize, demonstrating a
common framework confusion in the NR 569 curriculum.
Q3. In the NGN Clinical Judgment Measurement Model (CJMM), which action best represents
the "Analyze Cues" step when a 75-year-old presents with confusion, hypotension (BP 88/50),
and temperature 38.9°C?
A. Immediately administer broad-spectrum antibiotics and isotonic IV fluids
B. Recognize that the combination of altered mental status, hemodynamic instability, and fever
form a cluster suggesting sepsis
C. Prioritize which diagnosis is most likely before obtaining additional clinical data
D. Evaluate the patient response to initial fluid resuscitation after 30 minutes
Correct Answer: B
Rationale: The "Analyze Cues" step in the CJMM involves recognizing patterns and
clustering relevant clinical data to identify potential explanations. The combination of altered
mental status, hypotension, and fever is a classic sepsis cluster. Option A represents "Generate
Solutions" or "Take Action." Option C describes premature prioritization without adequate data
analysis. Option D represents "Evaluate Outcomes."
Q4. A 42-year-old female has 2 weeks of progressive fatigue, myalgias, and low-grade fevers.
She was diagnosed with viral syndrome 5 days ago but now presents with new petechiae on her
lower extremities and gum bleeding. Which red flag most significantly changes diagnostic
urgency?
A. Duration of symptoms extending beyond 10 days without improvement
B. New onset bleeding manifestations suggesting a potential hematologic emergency
C. Presence of myalgias which could indicate an autoimmune process
D. Low-grade fevers suggesting an undiagnosed infectious etiology requiring antibiotics
Correct Answer: B
, Rationale: New bleeding manifestations with progressive constitutional symptoms is a
critical red flag that dramatically shifts diagnostic urgency. This suggests thrombocytopenia with
bleeding risk, potentially indicating acute leukemia, aplastic anemia, DIC, or severe sepsis. The
2026 NCCN and ASH guidelines emphasize that new bleeding with systemic symptoms requires
immediate CBC with differential, coagulation studies, and peripheral smear. While duration,
myalgias, and fevers are concerning, they represent gradual progression rather than an acute
change signaling life-threatening pathology.
Q5. What is the fundamental principle for creating a differential diagnosis in acute care?
A. Always start with the rarest possible diagnosis to avoid missing anything
B. "Hoofbeats = Horses NOT Zebras" — common things occur commonly
C. Focus only on life-threatening conditions to the exclusion of all others
D. Include every possible diagnosis equally regardless of probability
Correct Answer: B
Rationale: The fundamental principle of differential diagnosis is that common conditions
occur commonly. While serious and life-threatening conditions must always be considered, the
most likely diagnosis should be based on prevalence and clinical probability. Option A is
impractical and leads to excessive testing. Option C risks anchoring bias and missing common
treatable conditions. Option D is inefficient and does not reflect clinical reasoning priorities.
Q6. A 55-year-old female presents with dyspnea. The Wells score estimates PE pre-test
probability at 15%. A D-dimer returns at 450 ng/mL (negative below 500). Using Bayesian
analysis, what is the most appropriate next step?
A. Discharge the patient since the negative D-dimer conclusively rules out PE
B. Proceed directly to CTPA because the pre-test probability is too high for D-dimer
C. Calculate post-test probability using the negative likelihood ratio to determine if PE is
excluded
D. Repeat the D-dimer in 24 hours to confirm the negative result before disposition
Correct Answer: C
Rationale: Bayesian analysis requires combining pre-test probability with test characteristics
(likelihood ratios) to determine post-test probability. The 2026 ACCP/ESC guidelines emphasize
that D-dimer interpretation must integrate clinical probability via validated scoring. A D-dimer
near the cutoff with moderate pre-test probability does not automatically exclude PE; the
, negative likelihood ratio must be applied. If post-test probability remains above the test
treatment threshold, further imaging is warranted. Simply discharging or reflexively imaging
both represent suboptimal diagnostic reasoning.
Q7. Which of the following best describes the concept of positive predictive value (PPV) in
diagnostic testing?
A. The probability that a patient with the disease has a positive test result
B. The probability that a patient with a negative test result does not have the disease
C. The probability that a patient with a positive test result actually has the disease
D. The proportion of all positive test results that are true positives in a population with high
disease prevalence
Correct Answer: C
Rationale: Positive predictive value (PPV) is defined as the probability that a patient with a
positive test result actually has the disease. Option A describes sensitivity. Option B describes
negative predictive value (NPV). Option D is a description of PPV in specific circumstances but
does not capture the full definition; PPV is markedly dependent on disease prevalence in the
population being tested.
Q8. A 65-year-old patient presents with acute dyspnea. The nurse practitioner estimates the
pretest probability of pulmonary embolism at 15%. A D-dimer assay is ordered and returns
negative. The D-dimer test used has a sensitivity of 95% and a specificity of 40% for PE. Which
principle best explains the clinical utility of this result?
A. A negative result on a highly sensitive test effectively rules out the disease (SnNout)
B. A positive result on a highly specific test effectively rules in the disease (SpPin)
C. The positive predictive value is more important than sensitivity in this scenario
D. The negative likelihood ratio of 0.15 means PE is still highly probable
Correct Answer: A
Rationale: The SnNout principle states that a negative result on a highly sensitive test
(sensitivity of 95% in this case) effectively rules out the disease because there are very few false
negatives. With a low pretest probability (15%) and a negative highly sensitive D-dimer, PE can
be safely excluded without further imaging. SpPin (option B) applies when using a positive result
on a highly specific test to confirm disease, which is not the scenario here. The PPV (option C)
