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NR 511 CEA (Clinical Encounter Application) Examination Mastery:
Comprehensive 220-Question Practice Bank Covering Differential
Diagnosis, Primary Care Across the Lifespan, Diagnostic Reasoning,
Pharmacotherapeutics, Health Promotion, and Advanced Clinical
Decision-Making with Detailed Rationales for Chamberlain University
Advanced Practice Nursing Students
SECTION A: CLINICAL REASONING AND DIFFERENTIAL DIAGNOSIS (Questions 1-40)
Subsection A1: Foundational Concepts (1-20)
1. A 45-year-old farmer presents with a 2-week history of an annular, erythematous rash with
central clearing and raised borders on his right forearm. He reports exposure to ticks while
clearing brush. What is the most likely diagnosis?
A. Tinea corporis
B. Erythema migrans (Lyme disease)
C. Nummular eczema
D. Contact dermatitis
E. Granuloma annulare
Correct Answer: B. Erythema migrans (Lyme disease)
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Rationale: Erythema migrans is the classic rash of early localized Lyme disease. It appears as an
annular erythematous lesion with central clearing (bull's-eye appearance) at the site of the tick
bite, typically 3-30 days after exposure. Tinea corporis is also annular but often has scaling at
the borders. Contact dermatitis is usually vesicular and pruritic.
2. The process of generating a differential diagnosis begins with which of the following steps?
A. Ordering diagnostic tests
B. Collecting a comprehensive history and performing a physical examination
C. Prescribing empiric therapy
D. Referring to a specialist
Correct Answer: B. Collecting a comprehensive history and performing a physical
examination
Rationale: The differential diagnosis process begins with a thorough history and physical
examination. This data forms the foundation for generating a problem list and identifying
potential diagnoses. Diagnostic testing and treatment follow after a differential is developed.
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3. Which of the following best defines a "must-not-miss" diagnosis?
A. The most common cause of a patient's symptoms
B. A diagnosis that, if missed, could result in significant morbidity or mortality
C. The diagnosis that is most likely based on epidemiological data
D. A diagnosis that requires specialist referral
Correct Answer: B. A diagnosis that, if missed, could result in significant morbidity or
mortality
Rationale: "Must-not-miss" diagnoses are serious conditions that, if overlooked, could lead to
severe harm or death. These are prioritized in the differential diagnosis process even if they are
less common than other possibilities.
4. A 28-year-old patient presents with a painful, erythematous, swollen area on the lower leg
with fever, chills, and malaise. The area is warm to touch with well-demarcated, raised
borders. What is the most appropriate initial management?
A. Warm compresses and elevation
B. Oral antibiotics covering Streptococcus and Staphylococcus
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C. Incision and drainage
D. Topical antibiotics
Correct Answer: B. Oral antibiotics covering Streptococcus and Staphylococcus
Rationale: This presentation is consistent with cellulitis, a bacterial infection of the dermis and
subcutaneous tissue. The most common pathogens are Streptococcus pyogenes and
Staphylococcus aureus. Oral antibiotics with coverage for these organisms are indicated. Warm
compresses are adjunctive, not primary treatment.
5. A 52-year-old patient presents with a 3-month history of a scaly, erythematous, well-
demarcated plaque on his elbow that is pruritic and worsens with stress. Physical exam
reveals silvery scale with punctate bleeding when scratched. What is the most likely
diagnosis?
A. Atopic dermatitis
B. Psoriasis
C. Seborrheic dermatitis
D. Lichen planus
Correct Answer: B. Psoriasis
NR 511 CEA (Clinical Encounter Application) Examination Mastery:
Comprehensive 220-Question Practice Bank Covering Differential
Diagnosis, Primary Care Across the Lifespan, Diagnostic Reasoning,
Pharmacotherapeutics, Health Promotion, and Advanced Clinical
Decision-Making with Detailed Rationales for Chamberlain University
Advanced Practice Nursing Students
SECTION A: CLINICAL REASONING AND DIFFERENTIAL DIAGNOSIS (Questions 1-40)
Subsection A1: Foundational Concepts (1-20)
1. A 45-year-old farmer presents with a 2-week history of an annular, erythematous rash with
central clearing and raised borders on his right forearm. He reports exposure to ticks while
clearing brush. What is the most likely diagnosis?
A. Tinea corporis
B. Erythema migrans (Lyme disease)
C. Nummular eczema
D. Contact dermatitis
E. Granuloma annulare
Correct Answer: B. Erythema migrans (Lyme disease)
,2
Rationale: Erythema migrans is the classic rash of early localized Lyme disease. It appears as an
annular erythematous lesion with central clearing (bull's-eye appearance) at the site of the tick
bite, typically 3-30 days after exposure. Tinea corporis is also annular but often has scaling at
the borders. Contact dermatitis is usually vesicular and pruritic.
2. The process of generating a differential diagnosis begins with which of the following steps?
A. Ordering diagnostic tests
B. Collecting a comprehensive history and performing a physical examination
C. Prescribing empiric therapy
D. Referring to a specialist
Correct Answer: B. Collecting a comprehensive history and performing a physical
examination
Rationale: The differential diagnosis process begins with a thorough history and physical
examination. This data forms the foundation for generating a problem list and identifying
potential diagnoses. Diagnostic testing and treatment follow after a differential is developed.
,3
3. Which of the following best defines a "must-not-miss" diagnosis?
A. The most common cause of a patient's symptoms
B. A diagnosis that, if missed, could result in significant morbidity or mortality
C. The diagnosis that is most likely based on epidemiological data
D. A diagnosis that requires specialist referral
Correct Answer: B. A diagnosis that, if missed, could result in significant morbidity or
mortality
Rationale: "Must-not-miss" diagnoses are serious conditions that, if overlooked, could lead to
severe harm or death. These are prioritized in the differential diagnosis process even if they are
less common than other possibilities.
4. A 28-year-old patient presents with a painful, erythematous, swollen area on the lower leg
with fever, chills, and malaise. The area is warm to touch with well-demarcated, raised
borders. What is the most appropriate initial management?
A. Warm compresses and elevation
B. Oral antibiotics covering Streptococcus and Staphylococcus
, 4
C. Incision and drainage
D. Topical antibiotics
Correct Answer: B. Oral antibiotics covering Streptococcus and Staphylococcus
Rationale: This presentation is consistent with cellulitis, a bacterial infection of the dermis and
subcutaneous tissue. The most common pathogens are Streptococcus pyogenes and
Staphylococcus aureus. Oral antibiotics with coverage for these organisms are indicated. Warm
compresses are adjunctive, not primary treatment.
5. A 52-year-old patient presents with a 3-month history of a scaly, erythematous, well-
demarcated plaque on his elbow that is pruritic and worsens with stress. Physical exam
reveals silvery scale with punctate bleeding when scratched. What is the most likely
diagnosis?
A. Atopic dermatitis
B. Psoriasis
C. Seborrheic dermatitis
D. Lichen planus
Correct Answer: B. Psoriasis
