NR576 / NR 576 Final Exam (2026/2027 Newly Updated): Differential Diagnosis in Adult-Gerontology
Primary Care | Guide with Verified Answers - Chamberlain 2026/2027 -- 2026/2027 Official Exam
OBJECTIVE ASSESSMENT - EXAM
NR576 / NR 576 Final Exam
(2026/2027 Newly Updated):
Differential Diagnosis in
Adult-Gerontology Primary
Care | Guide with Verified
Answers - Chamberlain
2026/2027 -- 2026/2027 Official
Exam
75 100% 2026/2027
QUESTIONS VERIFIED ANSWERS EDITION
TOPICS COVERED
Diagnostic Reasoning & Clinical Decision-Making Neurological & Musculoskeletal Conditions
Cardiovascular & Pulmonary Assessment Dermatological & Hematological Evaluation
Endocrine & Metabolic Disorders Mental Health & Multisystem Approach
COVER PAGE - 1
, Q1 Question 1 of 75
A 68-year-old woman presents to the primary care clinic with a 3-month history of progressive
fatigue, pale conjunctivae, and pica cravings for ice. Her hemoglobin is 9.2 g/dL and her MCV is 74
fL. The clinician uses pattern recognition to immediately form a working diagnosis. Which cognitive
strategy is the clinician employing?
A. Hypothetico-deductive reasoning with systematic data gathering
B. Pattern recognition based on a classic presentation cluster
C. Bayesian probability revision following lab result interpretation
D. Algorithmic decision-making using a standardized flowchart
Correct Answer: B
Rationale:
Pattern recognition (also called intuitive reasoning) allows experienced clinicians to identify diagnoses
rapidly when a patient's presentation matches a classic cluster of findings. The combination of fatigue,
pallor, pica, microcytic anemia, and low MCV forms a recognizable pattern of iron deficiency anemia.
Hypothetico-deductive reasoning (A) involves generating and testing multiple hypotheses sequentially,
which is slower and more deliberate than the instant matching seen here. Bayesian revision (C) involves
adjusting pre-test probability based on new data, while algorithmic approaches (D) follow fixed stepwise
protocols.
Q2 Question 2 of 75
A 72-year-old man with a history of hypertension, type 2 diabetes, and a 40-pack-year smoking
history presents with substernal chest pressure that began 20 minutes ago at rest. The pre-test
probability of acute coronary syndrome in this patient is estimated at 25%. An ECG shows
nonspecific ST-T wave changes. How does the clinician apply pre-test probability in this scenario?
A. Discharge the patient because the ECG is nondiagnostic and risk appears low
B. Admit for serial troponins and stress testing given the high pre-test probability despite a nondiagnostic
ECG
C. Order a CT angiogram immediately as the definitive next step regardless of pre-test risk
D. Reassure the patient that at 25% probability, acute coronary syndrome is unlikely and follow up in one
week
Correct Answer: B
Rationale:
A pre-test probability of 25% for acute coronary syndrome is considered intermediate-to-high in an older
adult with multiple risk factors, warranting further inpatient workup with serial cardiac biomarkers and
functional testing. A nondiagnostic ECG does not rule out ACS in this population because atypical
presentations are common. Discharging (A) or reassuring (D) would be dangerous given the clinical
context. CT angiogram (C) is not the appropriate immediate next step without first obtaining biomarkers in
this stable but high-risk patient.
NR576 / NR 576 Final Exam (2026/2027 Newly Updated): Differential Diagnosis in Adult-Gerontology Primary Care | Guide with Verified Answers - Chamberlain 2026/2027 -- 2026/2027 Official Exam
-- 2026/2027 | Passing Score: 80% | Page 2
, Q3 Question 3 of 75
A 55-year-old man reports a sudden-onset severe headache described as the worst headache of
his life, with neck stiffness and photophobia developing over 30 minutes. His blood pressure is
168/98 mmHg. Which clinical feature makes subarachnoid hemorrhage the most critical diagnosis
to exclude on the differential?
A. The elevated blood pressure reading on initial assessment
B. The thunderclap quality of the headache reaching maximum intensity within seconds
C. The presence of photophobia which is pathognomonic for meningeal irritation
D. The patient's age placing him in the highest-risk demographic for cerebrovascular events
Correct Answer: B
Rationale:
A thunderclap headache that reaches maximum intensity within seconds is the hallmark red flag for
subarachnoid hemorrhage and mandates immediate emergent evaluation with non-contrast head CT and
lumbar puncture if the CT is negative. While hypertension (A) is a risk factor, it is not specific to SAH.
Photophobia (C) suggests meningeal irritation but is not pathognomonic, and age alone (D) does not make
SAH the critical diagnosis to exclude in this context.
Q4 Question 4 of 75
A 65-year-old woman with known cholecystitis presents with severe right upper quadrant pain
radiating to her right shoulder. The clinician diagnoses acute cholecystitis and orders an abdominal
ultrasound without considering other possible causes of her symptoms. Three hours later, her ECG
reveals ST elevations. Which cognitive bias most likely led to the initial diagnostic error?
A. Availability bias from recently seeing several cholecystitis cases in the clinic
B. Anchoring bias causing premature fixation on the known diagnosis of cholecystitis
C. Confirmation bias from interpreting all findings through the lens of gallbladder disease
D. Premature closure by accepting the initial diagnosis without generating a broad differential
Correct Answer: B
Rationale:
Anchoring bias occurs when a clinician prematurely fixates on an initial piece of information (in this case,
the known history of cholecystitis) and fails to adjust as new data emerges. The right upper quadrant pain
with shoulder radiation can also be caused by acute coronary syndrome, particularly inferior MI, which was
missed. Availability bias (A) relates to over-weighting diagnoses recently encountered, while confirmation
bias (C) involves seeking only data that supports a favored hypothesis. Premature closure (D) is related but
anchoring better describes the failure to update from the initial anchored diagnosis.
Q5 Question 5 of 75
A 70-year-old man presents with a 15-pound unintentional weight loss over 3 months, decreased
appetite, and new-onset night sweats. His physical examination reveals bilateral supraclavicular
NR576 / NR 576 Final Exam (2026/2027 Newly Updated): Differential Diagnosis in Adult-Gerontology Primary Care | Guide with Verified Answers - Chamberlain 2026/2027 -- 2026/2027 Official Exam
-- 2026/2027 | Passing Score: 80% | Page 3
, lymphadenopathy. The clinician needs to construct a prioritized differential diagnosis. Which
condition should be placed at the top of the differential?
A. Hyperthyroidism given the weight loss and metabolic changes
B. Malignancy, specifically lymphoma, given the constitutional symptoms and lymphadenopathy pattern
C. Depression-related anorexia as the most common cause of weight loss in older adults
D. Chronic obstructive pulmonary disease with cachexia from increased metabolic demand
Correct Answer: B
Rationale:
The combination of unintentional weight loss exceeding 5% of body weight, night sweats (B symptoms),
and bilateral supraclavicular lymphadenopathy (Virchow nodes) is highly concerning for malignancy,
particularly lymphoma. These findings together create a red-flag cluster that elevates malignancy to the top
of the differential. Hyperthyroidism (A) typically presents with additional signs such as tachycardia and
tremor. Depression (C) would not explain the lymphadenopathy or night sweats. COPD (D) would present
with respiratory symptoms and a significant smoking history rather than lymphadenopathy.
Q6 Question 6 of 75
A 60-year-old woman presents with acute onset dyspnea and left leg swelling following a 6-hour
flight. The D-dimer result is 850 ng/mL (reference < 500 ng/mL). The clinician notes that the
D-dimer has a sensitivity of 95% but a specificity of only 40% for pulmonary embolism in this clinical
context. What is the correct interpretation of this result?
A. The positive D-dimer confirms pulmonary embolism, and the patient should be started on
anticoagulation immediately
B. The elevated D-dimer significantly increases the probability of pulmonary embolism given the
intermediate pre-test probability
C. The low specificity means this result is essentially unhelpful and should be disregarded in clinical
decision-making
D. The negative predictive value of this test approaches 100%, ruling out pulmonary embolism
definitively
Correct Answer: B
Rationale:
In a patient with an intermediate pre-test probability (recent long-haul travel, unilateral leg swelling, acute
dyspnea), a positive D-dimer raises the post-test probability of pulmonary embolism significantly,
warranting further imaging such as CT pulmonary angiography. However, the 40% specificity means many
false positives occur, so D-dimer alone cannot confirm PE (A). The result is not unhelpful (C); rather, it
must be interpreted in the clinical context. Option (D) describes negative D-dimer utility, which does not
apply to this positive result.
Q7 Question 7 of 75
NR576 / NR 576 Final Exam (2026/2027 Newly Updated): Differential Diagnosis in Adult-Gerontology Primary Care | Guide with Verified Answers - Chamberlain 2026/2027 -- 2026/2027 Official Exam
-- 2026/2027 | Passing Score: 80% | Page 4
Primary Care | Guide with Verified Answers - Chamberlain 2026/2027 -- 2026/2027 Official Exam
OBJECTIVE ASSESSMENT - EXAM
NR576 / NR 576 Final Exam
(2026/2027 Newly Updated):
Differential Diagnosis in
Adult-Gerontology Primary
Care | Guide with Verified
Answers - Chamberlain
2026/2027 -- 2026/2027 Official
Exam
75 100% 2026/2027
QUESTIONS VERIFIED ANSWERS EDITION
TOPICS COVERED
Diagnostic Reasoning & Clinical Decision-Making Neurological & Musculoskeletal Conditions
Cardiovascular & Pulmonary Assessment Dermatological & Hematological Evaluation
Endocrine & Metabolic Disorders Mental Health & Multisystem Approach
COVER PAGE - 1
, Q1 Question 1 of 75
A 68-year-old woman presents to the primary care clinic with a 3-month history of progressive
fatigue, pale conjunctivae, and pica cravings for ice. Her hemoglobin is 9.2 g/dL and her MCV is 74
fL. The clinician uses pattern recognition to immediately form a working diagnosis. Which cognitive
strategy is the clinician employing?
A. Hypothetico-deductive reasoning with systematic data gathering
B. Pattern recognition based on a classic presentation cluster
C. Bayesian probability revision following lab result interpretation
D. Algorithmic decision-making using a standardized flowchart
Correct Answer: B
Rationale:
Pattern recognition (also called intuitive reasoning) allows experienced clinicians to identify diagnoses
rapidly when a patient's presentation matches a classic cluster of findings. The combination of fatigue,
pallor, pica, microcytic anemia, and low MCV forms a recognizable pattern of iron deficiency anemia.
Hypothetico-deductive reasoning (A) involves generating and testing multiple hypotheses sequentially,
which is slower and more deliberate than the instant matching seen here. Bayesian revision (C) involves
adjusting pre-test probability based on new data, while algorithmic approaches (D) follow fixed stepwise
protocols.
Q2 Question 2 of 75
A 72-year-old man with a history of hypertension, type 2 diabetes, and a 40-pack-year smoking
history presents with substernal chest pressure that began 20 minutes ago at rest. The pre-test
probability of acute coronary syndrome in this patient is estimated at 25%. An ECG shows
nonspecific ST-T wave changes. How does the clinician apply pre-test probability in this scenario?
A. Discharge the patient because the ECG is nondiagnostic and risk appears low
B. Admit for serial troponins and stress testing given the high pre-test probability despite a nondiagnostic
ECG
C. Order a CT angiogram immediately as the definitive next step regardless of pre-test risk
D. Reassure the patient that at 25% probability, acute coronary syndrome is unlikely and follow up in one
week
Correct Answer: B
Rationale:
A pre-test probability of 25% for acute coronary syndrome is considered intermediate-to-high in an older
adult with multiple risk factors, warranting further inpatient workup with serial cardiac biomarkers and
functional testing. A nondiagnostic ECG does not rule out ACS in this population because atypical
presentations are common. Discharging (A) or reassuring (D) would be dangerous given the clinical
context. CT angiogram (C) is not the appropriate immediate next step without first obtaining biomarkers in
this stable but high-risk patient.
NR576 / NR 576 Final Exam (2026/2027 Newly Updated): Differential Diagnosis in Adult-Gerontology Primary Care | Guide with Verified Answers - Chamberlain 2026/2027 -- 2026/2027 Official Exam
-- 2026/2027 | Passing Score: 80% | Page 2
, Q3 Question 3 of 75
A 55-year-old man reports a sudden-onset severe headache described as the worst headache of
his life, with neck stiffness and photophobia developing over 30 minutes. His blood pressure is
168/98 mmHg. Which clinical feature makes subarachnoid hemorrhage the most critical diagnosis
to exclude on the differential?
A. The elevated blood pressure reading on initial assessment
B. The thunderclap quality of the headache reaching maximum intensity within seconds
C. The presence of photophobia which is pathognomonic for meningeal irritation
D. The patient's age placing him in the highest-risk demographic for cerebrovascular events
Correct Answer: B
Rationale:
A thunderclap headache that reaches maximum intensity within seconds is the hallmark red flag for
subarachnoid hemorrhage and mandates immediate emergent evaluation with non-contrast head CT and
lumbar puncture if the CT is negative. While hypertension (A) is a risk factor, it is not specific to SAH.
Photophobia (C) suggests meningeal irritation but is not pathognomonic, and age alone (D) does not make
SAH the critical diagnosis to exclude in this context.
Q4 Question 4 of 75
A 65-year-old woman with known cholecystitis presents with severe right upper quadrant pain
radiating to her right shoulder. The clinician diagnoses acute cholecystitis and orders an abdominal
ultrasound without considering other possible causes of her symptoms. Three hours later, her ECG
reveals ST elevations. Which cognitive bias most likely led to the initial diagnostic error?
A. Availability bias from recently seeing several cholecystitis cases in the clinic
B. Anchoring bias causing premature fixation on the known diagnosis of cholecystitis
C. Confirmation bias from interpreting all findings through the lens of gallbladder disease
D. Premature closure by accepting the initial diagnosis without generating a broad differential
Correct Answer: B
Rationale:
Anchoring bias occurs when a clinician prematurely fixates on an initial piece of information (in this case,
the known history of cholecystitis) and fails to adjust as new data emerges. The right upper quadrant pain
with shoulder radiation can also be caused by acute coronary syndrome, particularly inferior MI, which was
missed. Availability bias (A) relates to over-weighting diagnoses recently encountered, while confirmation
bias (C) involves seeking only data that supports a favored hypothesis. Premature closure (D) is related but
anchoring better describes the failure to update from the initial anchored diagnosis.
Q5 Question 5 of 75
A 70-year-old man presents with a 15-pound unintentional weight loss over 3 months, decreased
appetite, and new-onset night sweats. His physical examination reveals bilateral supraclavicular
NR576 / NR 576 Final Exam (2026/2027 Newly Updated): Differential Diagnosis in Adult-Gerontology Primary Care | Guide with Verified Answers - Chamberlain 2026/2027 -- 2026/2027 Official Exam
-- 2026/2027 | Passing Score: 80% | Page 3
, lymphadenopathy. The clinician needs to construct a prioritized differential diagnosis. Which
condition should be placed at the top of the differential?
A. Hyperthyroidism given the weight loss and metabolic changes
B. Malignancy, specifically lymphoma, given the constitutional symptoms and lymphadenopathy pattern
C. Depression-related anorexia as the most common cause of weight loss in older adults
D. Chronic obstructive pulmonary disease with cachexia from increased metabolic demand
Correct Answer: B
Rationale:
The combination of unintentional weight loss exceeding 5% of body weight, night sweats (B symptoms),
and bilateral supraclavicular lymphadenopathy (Virchow nodes) is highly concerning for malignancy,
particularly lymphoma. These findings together create a red-flag cluster that elevates malignancy to the top
of the differential. Hyperthyroidism (A) typically presents with additional signs such as tachycardia and
tremor. Depression (C) would not explain the lymphadenopathy or night sweats. COPD (D) would present
with respiratory symptoms and a significant smoking history rather than lymphadenopathy.
Q6 Question 6 of 75
A 60-year-old woman presents with acute onset dyspnea and left leg swelling following a 6-hour
flight. The D-dimer result is 850 ng/mL (reference < 500 ng/mL). The clinician notes that the
D-dimer has a sensitivity of 95% but a specificity of only 40% for pulmonary embolism in this clinical
context. What is the correct interpretation of this result?
A. The positive D-dimer confirms pulmonary embolism, and the patient should be started on
anticoagulation immediately
B. The elevated D-dimer significantly increases the probability of pulmonary embolism given the
intermediate pre-test probability
C. The low specificity means this result is essentially unhelpful and should be disregarded in clinical
decision-making
D. The negative predictive value of this test approaches 100%, ruling out pulmonary embolism
definitively
Correct Answer: B
Rationale:
In a patient with an intermediate pre-test probability (recent long-haul travel, unilateral leg swelling, acute
dyspnea), a positive D-dimer raises the post-test probability of pulmonary embolism significantly,
warranting further imaging such as CT pulmonary angiography. However, the 40% specificity means many
false positives occur, so D-dimer alone cannot confirm PE (A). The result is not unhelpful (C); rather, it
must be interpreted in the clinical context. Option (D) describes negative D-dimer utility, which does not
apply to this positive result.
Q7 Question 7 of 75
NR576 / NR 576 Final Exam (2026/2027 Newly Updated): Differential Diagnosis in Adult-Gerontology Primary Care | Guide with Verified Answers - Chamberlain 2026/2027 -- 2026/2027 Official Exam
-- 2026/2027 | Passing Score: 80% | Page 4
