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511 Differential Diagnosis & Primary Care Practicum Midterm
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Exam!
,📋 Section 1: Clinical Triage & Differential Diagnosis Pathways
Question 1
An adult client presents to the primary care clinic complaining of a unilateral, throbbing
headache that has persisted for 14 hours. The client reports moderate photophobia,
phonophobia, and an episode of nausea, but denies visual disturbances or a preceding
aura. According to evidence-based diagnostic criteria, which of the following represents
the most likely primary diagnosis?
A) Acute tension-type headache.
B) Migraine headache without aura [health]
C) Cluster headache crisis.
D) Temporomandibular joint (TMJ) dysfunction.
Correct Answer: B) Migraine headache without aura [health]
Rationale: According to the International Classification of Headache Disorders, a
migraine without aura is characterized by a unilateral, throbbing or pulsating headache
lasting 4 to 72 hours, accompanied by at least one associated feature such as nausea,
vomiting, photophobia, or phonophobia [health]. Tension headaches are typically
bilateral, non-throbbing, and lack prominent gastrointestinal features [health].
Question 2
A 45-year-old female client presents with localized, progressive pain in her right upper
quadrant that radiates to her right scapula, accompanied by low-grade fever and
nausea. Physical examination reveals a positive Murphy's sign. Which diagnostic
imaging modality represents the gold-standard initial evaluation to confirm the
suspected differential diagnosis?
A) Plain abdominal flat-plate X-ray.
B) Right upper quadrant abdominal ultrasound [health]
C) Contrast-enhanced computed tomography (CT) scan.
D) Magnetic resonance cholangiopancreatography (MRCP).
Correct Answer: B) Right upper quadrant abdominal ultrasound [health]
Rationale: A positive Murphy's sign indicates acute cholecystitis [health]. A right upper
quadrant abdominal ultrasound stands as the evidence-based first-line diagnostic test of
choice due to its high sensitivity and specificity for detecting gallstones, gallbladder wall
thickening (>3 mm), and pericholecystic fluid [health].
Question 3
A client presents with an acute onset of severe localized knee pain, erythema, swelling,
and an inability to bear weight. The family nurse practitioner suspects acute gouty
arthritis. Which of the following diagnostic findings from a joint fluid aspirate analysis
represents the definitive confirmation for gout?
A) Rhomboid-shaped, weakly positive birefringent calcium pyrophosphate crystals.
B) Needle-shaped, strongly negatively birefringent monosodium urate crystals
under polarized light microscopy [health]
C) A total white blood cell count under 200 cells/µL with zero polymorphonuclear
leukocytes.
D) Elevated levels of serum rheumatoid factor matching systemic connective disease.
,Correct Answer: B) Needle-shaped, strongly negatively birefringent monosodium
urate crystals under polarized light microscopy [health]
Rationale: While elevated serum uric acid supports a presumptive diagnosis, the
definitive, gold-standard confirmation for acute gout is the direct visualization of needle-
shaped, strongly negatively birefringent monosodium urate crystals within the synovial
fluid aspirate of the affected joint [health]. Rhomboid crystals indicate pseudogout
[health].
🫁 Section 2: Cardiorespiratory & Infectious Disease Management
Question 4
An adult client presents to the primary care clinic with a 5-day history of productive
cough, thick rust-colored sputum, a fever of 39.0°C (102.2°F), and right-sided pleuritic
chest pain. Auscultation reveals localized crackles and increased tactile fremitus over
the right lower lung base. Which of the following diagnostic steps should the nurse
practitioner execute next?
A) Initiate a 10-day course of broad-spectrum oral antiviral medications.
B) Obtain a posterior-anterior (PA) and lateral chest X-ray to evaluate for alveolar
infiltration [health]
C) Order an emergency pulmonary ventilation-perfusion (V/Q) scan.
D) Schedule the client for a routine spirometry lung compliance check.
Correct Answer: B) Obtain a posterior-anterior (PA) and lateral chest X-ray to
evaluate for alveolar infiltration [health]
Rationale: The client presents with classic clinical signs of community-acquired
pneumonia (CAP), including fever, pleuritic pain, localized crackles, and increased
tactile fremitus indicating consolidation [health]. Evidence-based practice guidelines
mandate confirming the diagnosis via chest radiography (chest X-ray) showing a lobar
or segmental infiltrate prior to initiating targeted empiric antibiotic therapy [health].
Question 5
A 22-year-old college student presents with a sore throat, high fever, profound fatigue,
and generalized lymphadenopathy. Physical examination reveals tonsillar hypertrophy
with exudates and palpable, tender posterior cervical lymph nodes. The nurse
practitioner suspects infectious mononucleosis. Which laboratory test represents the
most rapid, reliable initial screening tool to support this differential diagnosis?
A) Serum rapid plasma reagin (RPR) screening.
B) Heterophile antibody test (Monospot test) [health]
C) Complete blood count showing a severe microcytic iron deficit.
D) A polymerase chain reaction (PCR) assay for human immunodeficiency virus (HIV).
Correct Answer: B) Heterophile antibody test (Monospot test) [health]
Rationale: Infectious mononucleosis, primarily caused by the Epstein-Barr virus (EBV),
characteristically presents with the clinical triad of fever, pharyngitis, and posterior
cervical lymphadenopathy [health]. The heterophile antibody (Monospot) test is the
, standard, high-utility point-of-care screening tool utilized in primary care to confirm the
presence of EBV-induced antibodies [health].
Question 6
An older adult client with a history of tobacco use disorder presents with chronic,
progressive dyspnea and a persistent cough. Spirometry is performed to evaluate for
Chronic Obstructive Pulmonary Disease (COPD). According to the Global Initiative for
Chronic Obstructive Lung Disease (GOLD) guidelines, which post-bronchodilator value
confirms the presence of airflow limitation?
A) A post-bronchodilator FEV1/FVC ratio greater than 0.80.
B) A post-bronchodilator FEV1/FVC ratio less than 0.70 [health]
C) A reversible improvement in FEV1 greater than 15% and 200 mL.
D) A forced vital capacity (FVC) reading matching maximum baseline metrics.
Correct Answer: B) A post-bronchodilator FEV1/FVC ratio less than 0.70 [health]
Rationale: GOLD guidelines dictate that a post-bronchodilator FEV1/FVC ratio of less
than 0.70 (70%) is the mandatory diagnostic threshold confirming persistent, irreversible
airflow limitation, defining the clinical presence of COPD [health]. Significant reversibility
(>12%) points toward asthma [health].
🫁 Section 3: Endocrine, Renal, and Musculoskeletal Primary Care
Question 7
A 52-year-old male client presents for a routine wellness evaluation. His fasting plasma
glucose is verified at 118 mg/dL, and a subsequent screening reveals an HbA1c level
of 6.1%. How should the family nurse practitioner interpret these laboratory findings?
A) Normal glucose tolerance requiring zero follow-up or lifestyle advice.
B) Prediabetes, requiring extensive lifestyle modifications, dietary counseling,
and close metabolic monitoring [health]
C) Confirmed Type 2 Diabetes Mellitus, mandating immediate dual-insulin therapy.
D) Secondary gestational diabetes driven by acute renal clearance errors.
Correct Answer: B) Prediabetes, requiring extensive lifestyle modifications,
dietary counseling, and close metabolic monitoring [health]
Rationale: According to the American Diabetes Association (ADA) diagnostic criteria,
prediabetes is established when a patient's fasting plasma glucose ranges between 100
to 125 mg/dL, or when their Glycated Hemoglobin (HbA1c) falls between 5.7% to 6.4%
[health]. Values at or above 126 mg/dL (fasting glucose) or 6.5% (HbA1c) confirm
diabetes mellitus [health].
Question 8
A young adult female client presents with a 3-day history of dysuria, urinary frequency,
urgency, and suprapubic discomfort. She denies fever, chills, nausea, or flank pain. A
clean-catch urinalysis reveals positive nitrites, positive leukocyte esterase, and 15 white
blood cells per high-power field. Which of the following represents the most appropriate